A. did I see; did I begin to learn B. I saw; I began to learn C. I saw; did I begin to learn D. did I see; I began to learn
答案与解析：C 句意：直到看了热门电影《阿凡达》我才对它有所了解。当not until放在句首时，主句要部分倒装，而until后的从句不倒装，故选C项。
21．(2010·苏北四市联考)Only when ______ hard ______ make your dream come true. A. do you work; you can B. you work; you can C. do you work; can you D. you work; can you
答案与解析：D 副词only与状语从句一起位于句首时，主句部分使用部分倒装的形式，从句部分不用倒装。
22．(2010·盐城市调研)Only if ________ the examinations ________ get the gift promised by your father.
A. you have passed; you will B. have you passed; will you C. you have passed; will you D. have you passed; you will
答案与解析：C only修饰状语从句放在句首时，主句要部分倒装。
23．(2010·南通联考)So suddenly ________ that the animals in the zoo looked very frightened during the total solar eclipse (日全食)．
A. did the sky turn dark B. the sky did turn dark C. turned the sky dark D. was the sky turned dark 答案与解析：A so...that...引导的含结果状语从句的复合句中，如果so放于句首，主句部分需要采用部分倒装的形式。so suddenly在本句中作状语，并放句首，故句子应采用部分倒装形式。句意：在日全食期间，天黑得如此突然以至于动物园里的动物看上去都非常害怕。
24．(2010·陕西质检)________ the doctor's advice, he would regain his health now. A. If he followed B. Had he followed C. Did he follow D. If he should follow
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答案与解析：B 根据主句“he would regain his health now.”可知从句应用与过去事实相反的虚拟语气，因此用过去完成时表示，只有B项符合题意。if引导的虚拟条件句中含有should, had, were等助动词时，可将if省略，然后将助动词提前构成倒装。D项表示的是对将来的假设，不合语意。
25．(2010·陕西质检)It was Alice and her husband who sent the old man to the hospital, ________？
A. wasn't it
B. didn't they
C. don't they D. wasn't he
答案与解析：A 这是一个强调句，反意疑问部分用wasn't it，对主句部分进行反问。 26．(2010·杭州质检)I understand why Sophie was angry but ________ was no need to be so rude to her brother.
A. it
B. that
C. there D. this
答案与解析：C There is/was no need to do...是常用句型，表示“没有必要做??”。
27．(2010·宁波模拟)________ we move the picture over there? Do you think it will look better?
A. If only
B. What if
C. As if D. Even if
答案与解析：B what if“要是??怎么样？”if only常引导虚拟条件句或感叹句。根据句意可知应选B项。 28．(2010·台州监测)Simon is crazy about playing video games; now he must be on his computer, ________？
A. mustn't he B. isn't he C. needn't he D. doesn't he 答案与解析：B 句意：西蒙玩电子游戏入迷了，现在他一定在电脑上打游戏，不是吗？当must表示“推测”时，反意疑问部分根据其后面的动词形式作相应的变化，本句表示对现在的推测，所以这里用isn'the。
29．(2010·嘉兴适应性考试)________ they found out why the plane crashed when they took out the black box.
A. Not until long afterwards that B. It was not until long afterwards that C. Not long until afterwards
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D. It was long afterwards until
答案与解析：B not until在句首时句子应该倒装，A项没有倒装，C项、D项结构不正确。B项强调not until从句，不必倒装。句意：在他们取出黑匣子不久之后就弄清了飞机坠毁的原因。
30．(2010·杭州质检)Never ________ that I would meet so many problems when I decided to take the job.
A. I have expected B. have I expected C. I expected D. did I expect
答案与解析：D 否定副词never置于句首时，句子要部分倒装，由此可以排除A、C两项；根据从句中的过去时态可知，D项正确。
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