Jack would have been a top student in his school at the time, but he ______ hard

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问题 Jack would have been a top student in his school at the time, but he ______ hard enough.

选项 A、hadn’t worked
B、should work
C、didn’t work
D、won’t work

答案 C

解析本题是混和虚拟句型，前半句是虚拟语气，是对过去情况的假设，而后半句是真实语气，同样也是过去的情况，所以，应该用一般过去时，因而，本题应选C。

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