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1.I don't know            he will come tomorrow,           he comes,I'll tell you.(  )
A.if; WhetherB.whether; Whether
C.if; ThatD.if; If

分析 我不知道他明天会不会来,如果来了,我就会告诉你.

解答 答案:D.本题考查宾语从句和状语从句.know后是宾语从句,用if或whether作为引导词,表示是否;第二句是条件状语从句,用if表示如果,故选D.

点评 if引导的从句,一是条件状语从句,译为"如果".He will come if you invite him.如果你请他,他会来的.
二是宾语从句,译为"是否".I wonder if she is ill.不知她是否病了.

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