Mr. Smith insists on doing some running even a cold morning.A. inB. onC. ofD. at

发布时间：2020-08-16 07:38:50

Mr. Smith insists on doing some running even      a cold morning.
A. in
B. on
C. of
D. at

网友回答

A. in
(答案→)B. on
C. of
D. at
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