13．Many medical scientists are racingtime to find a cure for H1N1 as soon as possible.A. o

发布时间：2020-08-16 06:04:45


13．Many medical scientists are racing    time to find a cure for H1N1 as soon as possible.
A. on
B. against
C. for
D. In

网友回答

A. on
(答案→)B. against
C. for
D. In
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