The old professor has three sons，________are doctors.A．all of themB．all of whomC_刷题宝

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The old professor has three sons，________are doctors.

A．all of them	B．all of whom
C．all of that	D．all of which

上一题下一题 0.64难度单项选择更新时间:2013-05-11 09:54:07

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