Theoldmanhastwodaughters,________aredoctors.A)bothofthemB)bothofwhomC)bothwhoD)theyboth
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题目内容：
The old man has two daughters,________ are doctors.
A) both of them
B) both of whom
C) both who
D) they both
优质解答
选择b
老人有两个女儿,他们都是医生.
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