You in person; a telephone would have been enough.A. couldn't have comeB. needn't have co

问题补充：

You in person; a telephone would have been enough.

A. couldn have come

B. needn have come

C. shouldn have come

D. mustn have come

答案：

A. couldn have come

(答案→)B. needn have come

C. shouldn have come

D. mustn have come

解析：B考察情态动词加完成式的用法。couldn have come不可能已经做了某事； needn have come 本不必做某事； shouldn have come本不应该做某事； mustn 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。