Question

“Who is singing in the hall?”

 “________ is Mr．Smith．________ is known to us that it is he who wrote it．

1. A.
   It … it
2. B.
   It … As
3. C.
   She … It
4. D.
   She … As

Answer 1

A
前一个的it作“这，那”解，指上下文所指的人或事，而后一个的it，是用作形式主语结构，指代后面的that it is he who wrote it．这句句子的意思是“谁在大厅里唱歌?”“是史密斯先生，众所周知，是他谱写了那首曲子。”