They climbed rocks, _____rivers and settled in the valley.A．acrossB．crossingC．

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They climbed rocks, _____rivers and settled in the valley.

A．across

B．crossing

C．crossed

D．and crossing

答案

解析

略

举一反三

I could have helped him out, to tell the truth, I _____ too busy.

A．am

B．was

C．have been

D．had been

题型：不详难度：| 查看答案

I stood there patiently until he ________ his work.

A．has finished

B．would finish

C．had finished

D．finishes

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– Will you go with us to the National Park?
--- Well, it _______.

A．depending

B．depends

C．depends on

D．is depended

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---Remember the first time we____ , Ed ?
　 ---Of course, I do. You _____ a song on the stage.

A．have met;sang　

B．met;sang

C．met;were singing

D．have met;have sung

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.---I’m sorry, but there’s no smoking room in this section on the train.
　 ---Oh, I _____ that, and I won’t smoke again.
　

A．don’t know

B．won’t know

C．didn’t know 　　

D．haven’t known

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