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