How long do you suppose it is he arrived there?A. when B. beforeC. afterD. since

问题补充：

How long do you suppose it is he arrived there?

A. when

B. before

C. after

D. since

答案：

A. when

B. before

C. after

(答案→)D. since

解析：考查连词辨析。A当…时；在那时；B在…之前；C在…后；D自从，既然；句意：你认为从她到那里到现在有多久了？根据句意说明D正确。