单项选择题

Senior managers assured investigators that ______ no time were they aware of illegal activities in their Accounting Department.

A.at
B. over
C. by
D. in
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单项选择题
During high school, Richard was ______ by his uncompromising determination to win at any cost.
A. distinguish
B. distinguished
C. distinguishable
D. distinguisher
单项选择题
Entry to the seminar is restricted to those who have received a personal ______ from the general manager.
A. bidding
B. appeal
C. invitation
D. honor
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