It is reported that many a new house at present in the disaster area in Gansu Province.A.

问题补充：

It is reported that many a new house at present in the disaster area in Gansu Province.

A. was being built

B. were being built

C. is being built

D. are being built

答案：

A. was being built

B. were being built

(答案→)C. is being built

D. are being built

解析：考查动词时态及主谓一致。A，B均为过去进行时；C，D为现在进行时。Many a 后跟单数名词，做主语时，谓语动词应该用单数形式。所以C选项正确。