14．This doubt had been in my mind for some time, but the research still went onsome reason

发布时间：2020-08-16 06:42:27

 
14．This doubt had been in my mind for some time, but the research still went on    some reasons.
A. to
B. about
C. for
D. In

网友回答

A. to
B. about
(答案→)C. for
D. In
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