问题
选择题
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
答案
答案：C
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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
答案：C