I don't know if she ．If she .let me know．( )A．comes, comesB．will come, comesC．comes, will comeD．will come, will 题目和参考答案——青夏教育精英家教网——

题目内容

6．I don't know if she____．If she ____，let me know．（　　）

	A．	comes； comes		B．	will come； comes
	C．	comes； will come		D．	will come； will

分析我不知道她是否会回来，如果她回来，让我知道，

解答答案：B．第一个if引导的是宾语从句，主句是一般现在时，从句时态不收限制，表达的是将来的事情用一般将来时will+动词原形，第二个人if引导的是条件装语从句，主句是祈使句，从句用一般现在时，主语she，故comes，故答案是B．

点评 if既可以引导宾语从句又可以引导状语从句．if充当宾语从句的连接词时，相当于whether，词义为"是否"，遵循宾语从句的时态规则，可根据语境选择任何时态；充当从属连词，引导条件状语从句时，词义为"如果"，若主句中的谓语动词用一般将来时，则从句中的谓语动词通常用一般现在时表示将来．

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