---Where is my reference book? It was he

问题选择题

---Where is my reference book? It was here a moment ago.---Someone ___ it by mistake.

A．could have taken

B．must take

C．might take

D．must have taken

答案

答案：D

在肯定句中对过去发生的事情的推测要用must have done。这里表示肯定有人错拿了。