(2013·濟(jì)南一中模擬)—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
A
選A　句意：“瑪麗可能把空瓶子放在什么地方了？”“她不可能扔掉，瓶子一定在某個地方。”第一空在疑問句中表示可能性用can；第二空表示“不可能做過某事”用can't have done，注意不能用mustn't表示推測。
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