— “May I speak to your manager Mr. Williams at five o’clock tonight?”
— “I’m sorry. Mr Williams to a conference by 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：
这题考查时态， by“到什么时候为止”，和相应的完成时连用，根据上下文，时间是：by then指“到今晚五点为止”，所以用将来完成时。