—May I speak to your manager Mr.Williams at five o’clock tonight? —I’m sorry. Mr. Williams

—May I speak to your manager Mr.Williams at five o’clock tonight?
—I’m sorry. Mr. Williams to a conference long before then.
A. will have gone
B. had gone
C. would have gone
D. has gone

(答案→)A. will have goneB. had goneC. would have goneD. has gone解析：考查时态。根据句中的时间状语at five o’clock tonight可知是将来发生的动作，再根据long before than可知用将来完成时。句意：——今晚五点钟我可以与你经理威廉姆斯先生谈谈吗？——对不起。他那时就早已经去开会了。故A正确。

好好学习下