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。