People who have regular physical exercise seldom catch a disease like H1N1 Flu ?A. don’t

问题补充：

People who have regular physical exercise seldom catch a disease like H1N1 Flu, ?

A. don’t they

B. haven’t they

C. do they

D. have they

答案：

A. don’t they

B. haven’t they

(答案→)C. do they

D. have they

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