--May I speak to your manager at four o’clock this afternoon?--I’m sorry. He to a confere

--May I speak to your manager at four o’clock this afternoon?
--I’m sorry. He to a conference long before then.
A. will have gone
B. had gone
C. would go
D. has gone

(答案→)A. will have goneB. had goneC. would goD. has gone解析：此处will have gone表示将来完成时；had gone 表示过去完成时； would go过去将来时； has gone现在完成时。句意：——今天下午四点我可以和你的经理谈谈吗？——对不起。他那时就早已经去开会了。根据句意这里用将来完成时。故选A。

谢谢了