单选题
Mr. Smith has two daughters, ______ are famous singers.
A、
both they
B、
both of them
C、
they both
D、
both of whom
【正确答案】
D
【答案解析】
[解析] 本题考查非限定性定语从句，其引导词有 which，who，whom等，A、B、C都不能引导从句。
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