I don’t know if Jack ________. If he ________, call me, please.

         A. comes; come           B. will come; will come

         C. will come; comes


【答案】C

【解析】考查從句時態(tài)用法。句意：我不知道杰克是否會來。如果他來了，請給我打電話。第一句中的if=whether, 引導的是賓語從句。Jack還沒有來，會不會來還不知道，該用將來時態(tài)還是用將來時態(tài)。后一句中的if從句為條件狀語從句。在時間和條件狀語從句中，用現(xiàn)在時態(tài)表示將來，所以選擇答案C。


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