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
解析：可联系答.案.网客服索取。
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