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I don’t know if he ______ me if he ______ free.

A. will help, will be B. helps, is C. will help, is D. helps, will be

C 【解析】句意:我不知道如果他有空,他是否幫助我。第二空if表示“如果”,引導的條件狀語從句,用一般現在時表示一般將來時,因此謂語用is。第一個if表示是否,引導的賓語從句,根據if引導的條件狀語從句用一般現在時,主句用一般將來時,故第一空用will help。故選C。
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