is quite natural a beginner can't read the books written in English very quickly.A. Which

问题补充：

is quite natural,a beginner can read the books written in English very quickly.

A. Which

B. As

C. What

D. It

答案：

A. Which

(答案→)B. As

C. What

D. It

解析：本题是连词的使用考查。as引导非限制性定语从句，表示“正如……那样”的含义。