people who have regular physical exercise seldom catch a disease like flu,_____?A.don not they B.have not they请问选什么?为什么?

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people who have regular physical exercise seldom catch a disease like flu,_____?A.don not they B.have not they请问选什么?为什么?

people who have regular physical exercise seldom catch a disease like flu,_____?A.don not they B.have not they请问选什么?为什么?
people who have regular physical exercise seldom catch a disease like flu,_____?
A.don not they B.have not they请问选什么?为什么?

people who have regular physical exercise seldom catch a disease like flu,_____?A.don not they B.have not they请问选什么?为什么?
这句话的主句是 People seldom catch a disease,seldom是否定意义的词.所以应该用 do they?

A
句子前边是现在时,前边句子可省略为,people catch a desease, 所以后边要用don‘t they。