You ______ that letter to James. However, you didn’t.

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问题 You ______ that letter to James. However, you didn’t.

选项 A、ought to write
B、ought to have written
C、should write
D、should be writing

答案B

解析 句意:你本应该给詹姆斯写信,然而,你没写。ought to have written是虚拟语气,与本句句意相符。
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