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【单选题】
A: I think I saw John at the festival yesterday. B: He _____ there. He's in Tokyo.
A.
couldn't have been
B.
might not have been
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】You _____ the test! You studied for so many hours.
A.
can't have failed
B.
may not have failed
【单选题】The police _____ the criminals right away, but they decided to watch them for a while instead.
A.
could have arrested
B.
must have arrested
【单选题】Linda didn't call yesterday as we had planned. She _____.
A.
must have forgotten
B.
must not have forgotten
【单选题】I didn't get any milk today, but I _____ now if you want.
A.
could have gone
B.
could go