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    精英家教网 > 高中英语 > 题目详情
    Children will work actively if _______. ?
    A．praiseB．praisedC．praisingD．to praise
    B
    错因分析：有些考生会认为if后要用动词-ing形式，或用不定式表示还未发生的行为，于是误选C或D。其实，这是条件状语从句的省略形式，根据主语与动词的关系可知，孩子们受到表扬，于是正确答案选B。拓展：在时间、条件、让步、比较等状语从句中，当从句的主语与主句的主语一致，且谓语部分含有be动词时，则可将从句的主语与be动词同时省略。如：The old man will be very excited when talking (="he" is talking) about his past experiences.  She will be unhappy if (she is) criticized.
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