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单项选择题

Silk（）by Chinese for thousands of years now.

A.has used
B.has been used
C.was used
D.is used

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单项选择题

By the end of this year, I（）enough money for a holiday

A.will save
B.will be saving
C.will have saved
D.will be saved

单项选择题

By next year he（）in New York for five years.

A.has worked
B.has been working
C.works
D.will have worked

单项选择题

The work（）by the time you get there.

A.will have been done
B.was done
C.had been done
D.has done

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