My brother and sister are ___________ doctors.A:all B:both C:each D:any

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My brother and sister are ___________ doctors.
A:all
B:both
C:each
D:any

both
all是三人以上..
each也是三人以上.
any是任何的意思.
both是两者都的意思.

B:both 表示两个
A:all 3个以上

B:both