— Is it for two months they have stayed here?— No. It’s only three weeks they arrived h

问题补充：

— Is it for two months they have stayed here?

— No. It’s only three weeks they arrived here.

A. that; since

B. that; after

C. since; before

D. when; that

答案：

(答案→)A. that; since

B. that; after

C. since; before

D. when; that

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