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【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
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【单选题】Linda didn't call yesterday as we had planned. She _____.
A.
must have forgotten
B.
must not have forgotten
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【单选题】Where's Greg? He _____ lost.
A.
couldn't have gotten
B.
must have gotten
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【单选题】I didn't get any milk today, but I _____ now if you want.
A.
could have gone
B.
could go
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