It was impolite for you to leave without saying goodbye; you really______have done so.

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问题 It was impolite for you to leave without saying goodbye; you really______have done so.

选项 A、shouldn’t
B、wouldn’t
C、couldn’t
D、mustn’t

答案A

解析 句意:没说声再见就离开是不礼貌的,你本不应该这样做。shouldn’t have done sth.本不应该做某事却做了。
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