單項(xiàng)選擇題Silk（）by Chinese for thousands of years now.

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


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題By next year he（）in New York for five years.

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

3.單項(xiàng)選擇題The work（）by the time you get there.

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

4.單項(xiàng)選擇題The farmer caught the boys（）his apples.

A.stealing
B.stole
C.to steal
D.would stea

5.單項(xiàng)選擇題（）all we should put the theory into practice.

A.Beside
B.To
C.Above
D.Of