问题
选择题
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
答案
答案：C
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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
答案：C