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科目： 來(lái)源：不詳 題型：單選題

Don't try to get off the bus ____ it has stopped.
A．whileB．a(chǎn)sC．sinceD．before

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科目： 來(lái)源：不詳 題型：單選題

I'll come and see you _____ I go to the countryside.
A．whileB．when .C．a(chǎn)s soon asD．before

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科目： 來(lái)源：不詳 題型：單選題

___ he came to study in the university, he has made much progress in the study of English.
A．WhileB．WhenC．SinceD．After

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科目： 來(lái)源：不詳 題型：單選題

Things have changed a lot ____ I wrote to you last time.
A．whenB．sinceC．a(chǎn)sD．before

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科目： 來(lái)源：不詳 題型：單選題

I'd like to go swimming ____ the water is not too cold.
A．forB．unlessC．ifD．whether

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科目： 來(lái)源：不詳 題型：單選題

Difficulties are nothing ___ we are not afraid of them.
A．forB．a(chǎn)sC．ifD．whether

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科目： 來(lái)源：不詳 題型：單選題

The doctor will not perform the operation ___ it is absolutely necessary.
A．whenB．ifC．forD．unless

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科目： 來(lái)源：不詳 題型：單選題

Go back ___ you came from.   
A．untilB．whereC．whichD．when

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科目： 來(lái)源：不詳 題型：單選題

He lay ___ the grass was the thickest.  
A．whereB．whenC．thatD．a(chǎn)fter

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科目： 來(lái)源：不詳 題型：單選題

You will find friendly people ___ you go in China.
A．whereB．a(chǎn)ndC．whereverD．so

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