You ________ in person; a telephone would have been enough.
A．couldn't have comeB．needn't have come
C．shouldn't have comeD．mustn't have come
B
B考察情態(tài)動詞加完成式的用法。couldn't have come不可能已經(jīng)做了某事；         needn't have come 本不必做某事； shouldn't have come本不應(yīng)該做某事；        mustn't禁止，千萬不要。句義：你本不必親自過來，打個電話就可以了。故B正確。
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