You could have done much better yesterday. Why ______?A、didn’t youB、couldn’t yo

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问题 You could have done much better yesterday. Why ______?

选项 A、didn’t you
B、couldn’t you
C、hadn’t you
D、shouldn’t you

答案 A

解析本题测试情态动词的用法。“could have done”表示“原本能做到的”，本身是对过去事件的评述，所以本句的时态也应该是过去的时态。所以选择A。

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