You ______ him out though you were very busy.

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问题 You ______ him out though you were very busy.

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

答案C

解析 should have done sth．意为：本应该做某事(但却没有做)，这句话的意思是“尽管你很忙，但是你(本)应该帮助他摆脱困境。”

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