Question

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

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

Answer 1

D。

both of which are being built in my hometown为非限制性定语从句，其中的which指代前面的two schools。