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

问题补充：

--- 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：

(答案→)A. will have gone

B. had gone

C. would have gone

D. has gone

解析：考察时态，根据上一句的tonight可知，该句用一般将来时，只有A符合要求，

句意为---我今晚五点能和你们的经理通电话吗？-----对不起，在那之前他就将已经去开会了。