---Mike must have known that.
---No, he ________. How _______ he?
A．mustn’t, mustB．may not, mightC．couldn’t, canD．needn’t, need
C
must have done對過去的肯定的推測，否定句用can’t或couldn’t；第二空根據(jù)題意他怎么會知道，因此本題選C。
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