单选题
You______him ont though you were very busy.
A、
should have helped
B、
must help
C、
ought to help
D、
could have helped
【正确答案】
A
【答案解析】
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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