请问这道题为什么选A?
theoldwomanhasthreesons,and__arestudyingabroadnowA.twoofthemB.twoofwhomC.c.twoofwho...
the old woman has three sons ,and __are studying abroad now
A.two of them B.two of whom C.c.two of who 展开
A.two of them B.two of whom C.c.two of who 展开
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