It is reported that two schools are being built in my hometown will open next year.A. they

问题补充：

It is reported that two schools,are being built in my hometown,will open next year.

A. they both

B. which both

C. both of them

D. both of which

答案：

A. they both

B. which both

C. both of them

(答案→)D. both of which

解析：both of which引导非限制性定语从句，which指代先行词schools,作of的宾语。they both和both of them都不能引导定语从句，所以是错误的。which both中的which不能修饰both，所以也是错误的。