—When did he leave the classroom?—He left _____you turned back to write on the

题型：不详难度：来源：

—When did he leave the classroom?
—He left _____you turned back to write on the blackboard.

A．the minute

B．the time

C．until

D．before

答案

解析

the minute="as" soon as，一---就---，你一转身，他就离开了。故选A。

举一反三

Jack had traveled six miles across the Channel _____his engine failed and was forced to land on the sea .

A．when

B．until

C．after

D．since

题型：不详难度：| 查看答案

Not that I’m unwilling to lend you a hand , ____I’m too busy for the moment .

A．because

B．but that

C．but

D．however

题型：不详难度：| 查看答案

John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .

A．when

B．as

C．before

D．while

题型：不详难度：| 查看答案

Although he knew little about the large amount of work done in the field , he succeeded ____other more well-informed experimenters failed.

A．as

B．unless

C．what

D．where

题型：不详难度：| 查看答案

I thought things would get better, but _____it is they are getting worse.

A．before

B．because

C．as

D．after

题型：不详难度：| 查看答案