is mentioned above the number of the cattle here has been limited to 200.A. ItB. WhichC.

问题补充：

is mentioned above, the number of the cattle here has been limited to 200.

A. It

B. Which

C. That

D. As

答案：

A. It

B. Which

C. That

(答案→)D. As

解析：考代词。关系代词as用来引导定语从句，置于句首，有“正如，如同”的意思。