He promised me a letter; he ought to ______ it days ago.

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问题 He promised me a letter; he ought to ______ it days ago.

选项 A、have written
B、write
C、had written
D、be writing

答案A

解析 ought to have done sth.意为“原本应该做某事(但却没做)”。

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考博英语

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