She had three sons, all became doctors . [ ] A．of them B．of which C．who D．of who
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She had three sons, all ________ became doctors .
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A．of them B．of whichC．who D．of whom试题答案
答案：D
She had three sons, all ________ became doctors .
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A．of them B．of whichC．who D．of whom答案：D