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

问题补充：

--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：

(答案→)A. will have gone

B. had gone

C. would go

D. has gone

解析： 考察时态。本题的关键词是long before then，之中的then是一个将来的时间at five o’clock this afternoon。这个时间状语表示的是在将来一个时间之前就完成的动作，故使用将来完成时的时态。句义：—在今天下午5点之前我可以和你们的经理聊聊吗？—对不起，在那之前很久他就已经去参加一个会议了。故A正确。