You in person; a telephone would have been enough.
A. couldn't have e
B. needn't have e
C. shouldn't have e
D. mustn't have e
网友回答
A. couldn't have e
(答案→)B. needn't have e
C. shouldn't have e
D. mustn't have e
解析：B考察情态动词加完成式的用法。couldn't have e不可能已经做了某事； needn't have e 本不必做某事； shouldn't have e本不应该做某事； mustn't禁止，千万不要。句义：你本不必亲自过来，打个电话就可以了。故B正确。