问题
The old man has two sons，________is a soldier.
A:one of whom
B:both of them
C:all of whom
D:both of whom
B:both of them
C:all of whom
D:both of whom
正确答案是：
同类题型
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______ I borrow two books at a time—Yes, you ______＿.
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Do you know the reason ____ she has changedher mind
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