问题
选择题
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
答案：C
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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：C