问题
选择题
---Mike must have known that.
---No, he ________. How _______ he?
A．mustn’t, must
B．may not, might
C．couldn’t, can
D．needn’t, need
答案
答案：C
must have done对过去的肯定的推测，否定句用can’t或couldn’t；第二空根据题意他怎么会知道，因此本题选C。
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