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【题目】 How long do you suppose it is ______ he arrived here?

No more than half a week.

A. when B. before C. after D. since

【答案】D

【解析】考查连词。把do you suppose看作插入语,去掉后观察主句和从句的时态可以看出从句用的是一般过去时,而主语用的是一般现在时,所以只能用since引导时间状语从句,It is+一段时间+since... 自从……到现在多久了。题干意思为“你认为他来到这里有多长时间了?”

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