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。