I have come here in time but I met an old friend of mine. I stopped and talked with him f

问题补充：

I have come here in time, but I met an old friend of mine. I stopped and talked with him for some time.

A. shouldn’t

B. must

C. needn’t

D. could

答案：

A. shouldn’t

B. must

C. needn’t

(答案→)D. could

解析：考查情态动词：句意：我本可能及时到，但是我遇到一个老朋友，我停下来和他谈了一段时间。Could have done过去本可以做却没做，A. shouldn’t have done过去本不应该做而做了，B. must have done过去一定做了，C. needn’t have done过去本不必做却做了，选D。