Mr. Grey has two sons ______ are famous writers.

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问题 Mr. Grey has two sons ______ are famous writers.

选项 A、they both
B、both of whom
C、both of them
D、both they

答案B

解析 本题考查非限制性定语从句。原句中,两个单句之间没有连词,所以应该是主句和从句的关系。both of whom引导的非限制性定语从句,来补充说明先行词sons。因此本句的答案是[B],意思是“他有两个儿子,(这两个儿子)都是有名的医生”。
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