12. Mr Black has two sons, are fond of collecting stamps.A. all of whomB. all of themC. b

发布时间：2020-08-16 06:45:08


12. Mr Black has two sons,      are fond of collecting stamps.
A. all of whom
B. all of them
C. both of them
D. both of whom

网友回答

A. all of whom
B. all of them
C. both of them
(答案→)D. both of whom
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