.We were all waiting for you .You _____for the seaside by yourself without leaving a message.
A．mustn’t leaveB．shouldn’t have leftC．couldn’t have leftD．needn’t leave
B
這是情態(tài)動(dòng)詞的特殊用法，shouldn’t have left表示本來不應(yīng)該做但實(shí)際已經(jīng)做了。
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