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【单选题】

You _____ the test! You studied for so many hours.

A.
can't have failed
B.
may not have failed
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【单选题】If you don't watch the cookies, they _____.
A.
might have burned
B.
might burn
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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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【简答题】The researchers are responsible for organizing the experiments, but their assistants actually ( ) them.
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【简答题】Some scientists believe personality characteristics are genetic, but ( ) on this issue because no research has proved this to be true.
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【简答题】People don’t like too much change because familiar experiences give them a feeling of ( ) and control over their lives.
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【简答题】Many people start a diet with the best ( ) of losing weight, but they find it difficult to change their behavior.
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【简答题】Do you agree or disagree with their ideas? Why or why not?
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