the twins have learned a lot ------ they came to china .连词填空

问题描述:

the twins have learned a lot ______ they came to china .连词填空
1个回答 分类:英语 2014-12-01

问题解答:

我来补答
since
因为主句是现在完成时,用since 作为连词最恰当
如用before 作为连词,主语要用过去完成时
 
 
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