—How long do you think it is he arrived here?　　—No more than half a year I believe.A. wh

问题补充：

—How long do you think it is he arrived here?

—No more than half a year, I believe.

A. when

B. that

C. before

D. since

答案：

A. when

B. that

C. before

(答案→)D. since

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