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

— “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

(答案→)A. will have goneB. had goneC. 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。

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