It is a shopping mall has been built in used to be a school.A. which; whereB. that; whatC

问题补充：

It is a shopping mall has been built in used to be a school.

A. which; where

B. that; what

C. which; that

D. that; where

答案：

A. which; where

(答案→)B. that; what

C. which; that

D. that; where

解析：考查强调句型和宾语从句。第一空that与it is构成强调句型，强调主语a shopping mall；第二空what引导宾语从句what used to be a school，在句中做主语。句意：一个购物中心建在了过去曾经是一所学校的地方。故B正确。