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    精英家教网 > 高中英语 > 题目详情
    While         the book on the top shelf , you need to be very careful .
    A．to reachB．reachingC．reachD．are reaching
    B

    试题分析：考查省略式，因为英语中如果主从句的主语一致的话，可以省略从句的主语和be动词，while reaching="when" (you are) reaching ,句意是：当你够架子上的书时，你需要小心。选B。
    点评：省略式是重要的考点，要求一定是主从句主语一致的时候才可以，另外做题时，可以使用还原法，把句子完整的形式写出来，再进行省略。
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