At the same time,another kind of paper was developed, made from silk.

At the same time,another kind of paper was developed, made from silk.

A.与此同时另一种纸被研究了出来，它用蚕丝制成。

B.与此同时还研制出另一种纸，就是用丝制的帛。

C.与此同时用丝制的帛作为另一种纸被研制了出。

D.与此同时另一种丝质的纸被研制了出来。

正确答案是B