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I don’t know when my son ________ back. When he_________ back, I’ll call you.
A.comes, comesB.will come, will come
C.comes, will comeD.will come, comes
D

试题分析:句意:我不知道我的儿子什么时间回来,当他回来了我会给你打电话。宾语从句的结构:主语+谓语+连接词+从句。从句在句中作宾语。从句要用陈述句的语序。如果主句是一般现在时,从句根据需要选择时态,如果主句是过去时态,从句要用相应的过去时态。第一个句子是宾语从句。时间状语从句中如果主从句的动作都没有发生,为了区别两个动作的先后关系,遵从主将从现的原则,第二个句子是时间状语从句,故选D。
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