Question

(2013·济南一中模拟)—Where ________ Mary have put the empty bottles?

—She ________ them away. They must be somewhere.

A．can; can't have thrown

B．must; needn't

C．must; must have thrown

D．can; mustn't have thrown

 

Answer 1

A

【解析】选A　句意：“玛丽可能把空瓶子放在什么地方了？”“她不可能扔掉，瓶子一定在某个地方。”第一空在疑问句中表示可能性用can；第二空表示“不可能做过某事”用can't have done，注意不能用mustn't表示推测。