单项选择题

Jim’s score on the test is the highest; he （）hard.

A. should have studied
B. could have studied
C. must have studied
D. could study

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Apart from an interesting-looking carved dagger, the box was full of crockery, much of it ______.
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单项选择题
The following are all correct responses to Jack has a new dictionary. EXCEPT ______.
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