How many more decades will have to pass ____ scientists succeed in providing a c

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How many more decades will have to pass ____ scientists succeed in providing a cure for cancer?

A．when

B．since

C．before

D．until

答案

解析

略

举一反三

The question occurred to me ______ we were to get the machine needed．

A．that

B．what

C．why

D．where

题型：不详难度：| 查看答案

Advertising is different from other forms of communication _________the advertiser pays for the message to be delivered．

A．in which

B．in order that

C．in that

D．in the way

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_______ difficulties we may com across, we"ll help one another to overcome them.

A．Wherever

B．Whatever

C．However

D．Whenever

题型：不详难度：| 查看答案

______ might be expected,the answer to the question was very mixed.

A．As

B．That

C．It

D．What

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I’m sorry you’ve been waiting so long, but it’ll still be some time ___ Brian gets back.

A．before

B．since

C．when

D．after

题型：不详难度：| 查看答案