—May I speak to your manager Mr. Williams at five o’clock tonight?
—I’m sorry, Mr. Williams to a conference before then.
A. will have gone
B. had gone
C. would have gone
D. has gone
网友回答
(答案→)A. will have gone
B. had gone
C. would have gone
D. has gone
解析：考查时态：句意：-----我可以在今天下午五点跟你们经理Mr. Williams通话嘛？--很抱歉，今晚5点钟前，他将已经去开会啦。和before then连用，用将来完成时。选A。