You______him ont though you were very busy.A、should have helpedB、must helpC、ou

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问题 You______him ont though you were very busy.

选项 A、should have helped
B、must help
C、ought to help
D、could have helped

答案 A

解析句意：你本应该帮助他离开的，尽管你很忙。[A] should have helped表示你本应该做某事(但实际你没做)，最符合题意。

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