Question

is the hardworking at school

          is known，the students in that school are hardworking．（　　）

A. Which

B. It

C. As

D. That

Answer 1

答案是C．
考查定语从句，本句是一个非限制性定语从句，as是关系代词指代主句the students in that school are hardworking的整个句子的意思，翻译成"正如"，置于句首．所以答案选C．