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
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This doubt had been in my mind for some time, but the research still went on _________ some reasons．


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  2. B.
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14．This doubt had been in my mind for some time, but the research still went on____some reasons.

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This doubt had been in my mind for some time, but the research still went on        some reasons.

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