We didn’t start our discussion _____ everybody arrived.A．sinceB．ifC．whileD．until

题型：不详难度：来源：

We didn’t start our discussion _____ everybody arrived.

A．since

B．if

C．while

D．until

答案

解析

考查点：not…until…的用法。解题思路：not…until表示“直到……才……”,句意为“直到每个人都到齐了我们才开始讨论。”since表示“自……以来；既然，由于”；if表示“如果”表假设关系，while“虽然，当……时候”，均与句意不符；

举一反三

You’ll be late __________ you don’t get up now.

A．if

B．before

C．until

D．after

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Keep off the drugs（毒品）, you and your family will be in great danger?

A．and

B．or

C．but

D．so

题型：不详难度：| 查看答案

I often watch TV, this evening I’m doing my homework .

A．and

B．but

C．or

D．so

题型：不详难度：| 查看答案

I usually sleep with the window open _____ it’s very cold.

A．until

B．unless

C．when

D．if

题型：不详难度：| 查看答案

After school he didn’t go home . _______ he went to the Internet café (网吧)..

A．But

B．While

C．Instead

D．Instead of

题型：不详难度：| 查看答案