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2.-Do you know if she _______  to visit us?
-I think she will come if she ________ free tomorrow.(  )
A.comes; isB.will come; is
C.comes; will beD.will come; will be

分析 --你知道她是否会来看望我们吗?
--我认为如果她明天有空,她会来的.

解答 答案:B
此题考查if引导的从句:if意为"是否"引导宾语从句,if意为"如果",引导条件转语从句;
根据题干句意知第一个if为"是否"之意,故符合宾语从句时态规则,主句Do you know为一般现在时,从句可根据自身情况选择,根据答语知她来看望是发生在将来的事,故应用一般将来时,will come;
第二个if意为"如果"故采用条件状语从句:主将从现,if所在为从句,使用一般现在时,且主语为第三人称单数she,故填is.故选B.

点评 此题重在考查if引导的宾语从句和条件状语从句.考生需根据句意明确判断词意,再根据不同的从句采用不同的时态.

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