问题
选择题
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
答案
答案：D
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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
答案：D