.It is reported that two schools fell into ruins in the earthquake are being rebuilt and

问题补充：

.It is reported that two schools,fell into ruins in the earthquake, are being rebuilt and will be open next term.

A. they both

B. both of which

C. which both

D. both of them

答案：

A. they both

(答案→)B. both of which

C. which both

D. both of them

解析：考查非限制性定语从句。句意“据报道，两所学校在地震中称了废墟，它们正在被重建，下个学期投入使用。”题目所给范围是两者，故用both，意为“两者都”；根据逗号可知，是非限制性定语从句，排除A、D；both of which相当于and both of them。故选B。