—Was the boy saved? —No. The doctors tried their best, _____ they failed. [

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—Was the boy saved?
—No. The doctors tried their best, _____ they failed.

[ ]

A. and
B. or
C. but
D. so

答案

举一反三

It"s raining heavily _____ the farmers keep on working in the field.
A. but
B. though
C. till
D. because

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Peter likes sports very much, _____ he doesn"t like football.
A. and
B. but
C. or
D. so

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It"s dark, _____ he"s still working in the office.
A. and
B. so
C. but
D. until

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He can"t ride a bike, _____ this evening? [ ]
A. but
B. and
C. or

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_____ Lily _____ Lucy can go with you, because one of them have to stay here to look after their
mother.
A. Either, or
B. Neither, nor
C. Both, and
D. Not only, but also

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