I her, but I never could． [ ] A．ought to help B．must help C．must have helped D．ought to have helped 题目和参考答案——青夏教育精英家教网—

题目内容

I ________ her, but I never could．

[　　]

A．ought to help

B．must help

C．must have helped

D．ought to have helped

答案：D

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