19．We’d better set off now, or it will be dark__________we know it.A．untilB．aft

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19．We’d better set off now, or it will be dark__________we know it.

A．until

B．after

C．when

D．Before

答案

解析

略

举一反三

Studying alone, you are free to choose what to learn and when, ________ you don’t need others’ agreement.

A．while

B．if

C．though

D．as

题型：不详难度：| 查看答案

Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ________ appear in the working world.

A．where

B．when

C．that

D．What

题型：不详难度：| 查看答案

7．There are signs______a new, different South is coming out of its dark past.

A．that

B．which

C．when

D．Where

题型：不详难度：| 查看答案

12．I have written down everything that I saw and heard____memories are still fresh.

A．since

B．while

C．before

D．Unless

题型：不详难度：| 查看答案

17．－I didn"t pass the English exam.
－Work hard, _______you"ll succeed.

A．and

B．but

C．or

D．So

题型：不详难度：| 查看答案