I think it will be quite a long time Mike from Canada．( )A．when, has returnedB．since, has returnedC．before, returnsD．after, returned 题目和参考答案——青夏教育精英家教网——

题目内容

11．I think it will be quite a long time _______ Mike _______ from Canada．（　　）

	A．	when； has returned		B．	since； has returned
	C．	before； returns		D．	after； returned

分析我认为还要很长时间迈克才能从加拿大回来．

解答答案：C．根据选项since自从…，before在…前，when当…时，after在…之后，再结合句意，我认为还要很长时间迈克才能从加拿大回来，可知此处缺少了一个引导时间状语从句的连接词，句型It will be+一段时间+before…可翻译为，还要多长时间才…，故C正确．

点评本题考查时间状语从句的连接词，在充分分析句型再结合语义的基础上便能选出正确答案，同时要注意其他选项的意思，

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