Question

【题目】

My English-Chinese dictionary has disappeared. Who have taken it？

A. should

B. must

C. could

D. would

Answer 1

【答案】C

【解析】由句末的问号可知说话者并不知道谁拿走了字典，must r have done 一定做了，表示非常肯定的推测 ; would have done为过去将来完成时，表示过去将来某一时间以前发生的动作；should have done(本应做……)不符句意。could have done可能做了某事，表推测。故选C。