Question

—Can I have a talk with you at about 4 this afternoon，Mr Black?

—All right，I ________from a conference by then.I will be waiting for you.

A. will have come back    B. will come back

C. have come back    D. will be coming back

Answer

A

【解析】考查动词时态。根据答语中的“by then”和“I will be waiting for you.”可知，此处表示的是到将来某个时间之前已经完成的动作，故用将来完成时态。故选A。

【名师点睛】

将来完成时主要用法归纳

1. 表示将来完成

即表示到将来某个时间为止势必会完成或预计要完成的动作。如：Maybe by then you will have changed your mind. 也许到时候你已经改变主意了。“You'll have finished by tomorrow.” “I wish!” “你到明天就完成了。”“但愿如此! ”

2. 表示动词的持续

即表示某种状况将一直持续到说话人所提及某一将来时间。如：We will have been married a year on June 25th 到6月25日我们俩结婚就满1年了。By this time next week, I will have worked for this company for 24 years. 到下星期此刻，我已经为该公司干了24年了。

3. 表示推测

即表示根据某情况作出的推测。如：There will have been a definite result before Friday. 星期五以前将肯定会有结果。

本题考查动词时态。根据答语中的“by then”和“I will be waiting for you.”可知，此处表示的是到将来某个时间之前已经完成的动作，故用将来完成时态。故选A。