You____that letter to James. However , you didn't.
A.ought to write
B. ought to have written
C.should write
D.should be writing
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正确答案: B 答案分析: 「句意」 你本应该给詹姆斯写信,然而,你没写。
「难点」 ought to have written 是虚拟语气,与本句句意相符。
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