. —What are you worrying about? —It is there is any chance of being infected by AH1N1 vir

发布时间：2020-08-16 11:20:31


. —What are you worrying about?
—It is      there is any chance of being infected by AH1N1 virus.
A. why
B. that
C. if
D. whether

网友回答

A. why
B. that
C. if
(答案→)D. whether
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