The fact he didn’t see Lao Li yesterday is true.A. whichB. thatC. whenD. what

问题补充：

The fact he didn’t see Lao Li yesterday is true.

A. which

B. that

C. when

D. what

答案：

A. which

(答案→)B. that

C. when

D. what

解析：同位语从句说明fact的具体内容,只用that引导,不能省略。不用which引导,that只起连接作用,不作句子成分。