Aren’t you tired? I______you had done enough for today.

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问题 Aren’t you tired? I______you had done enough for today.

选项 A、should have thought
B、must have thought
C、might have thought
D、could have thought

答案D

解析 “provided that+从句”表示假设，provided相当于if。根据句意，这里表示一种真实的条件句，表示“许可、建议”时，在英语口语中通常用can或may，而不用could或might。因此D正确。

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专业英语四级

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