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16.-Do you know if she ______tomorrow?-If she ____ tomorrow,I will tell you.(  )
A.will come,comesB.comes,will come
C.will come,will comeD.comes,comes

分析 --你知道她明天是否回来吗?
--如果明天她回来,我会告诉你.

解答 答案:A.if有如果和是否的意思."Do you know if she ______tomorrow"中的if是"是否"的意思引导的是宾语从句,主句是一般现在时时,宾语从句根据需要选时态,出现"tomorrow明天"故用一般将来时;"If she ____ tomorrow,I will tell you"if是"如果"的意思,引导条件状语从句.主句是一般将来时,if引导的条件状语从句要用一般现在时表将来,这就是主将从现.故选A.

点评 本题要求掌握if作为"如果"和"是否'这两个意思的不同用法,并且掌握一般现在时和一般将来时的构成.

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