【题目】 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
在线课程【答案】D
【解析】
试题分析：本题考查定语从句。空格前有逗号，表明应该是非限制性定语从句，可以排除A、C；both of which 在从句中作主语，且符合 both 的搭配习惯。故正确答案为D。