The speaker mentioned some writers and books were known to us.A. thatB. whichC. /D. who

问题补充：

The speaker mentioned some writers and books were known to us.

A. that

B. which

C. /

D. who

答案：

(答案→)A. that

B. which

C. /

D. who

解析：考查定语从句。先行词里有人也有物的时候，且从句中缺少主语或宾语，应使用关系代词that。