30. How long do you think it will be _____ we can find a new water source?A．afte

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30. How long do you think it will be _____ we can find a new water source?

A．after

B．before

C．when

D．Since

答案

解析

略

举一反三

30. He will not tell the fact ______she has gone to Beijing.

A．which

B．what

C．that

D．How

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32. Once he starts a job, he won’t stop ______ it’s finished.

A．if

B．until

C．after

D．While

题型：不详难度：| 查看答案

27. _____ the teacher came in, everyone was quiet.

A．Direct

B．Directly

C．Directly when

D．Direct when

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48. I will ask my father to telephone you _____ he comes back.

A．hardly

B．suddenly

C．quickly

D．Immediately

题型：不详难度：| 查看答案

90. ____ the work was very difficult, they managed to finish it in time.

A．Because

B．Though

C．Therefore

D．But

题型：不详难度：| 查看答案