More than once ______us by now to adhere to the rules and disciplines of our uni

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问题 More than once ______us by now to adhere to the rules and disciplines of our university.

选项 A、has our teacher told
B、our teacher has told us
C、did our teacher tell
D、our teacher told

答案 A

解析倒装和动词时态题。当表示频率的状语放在句首时，其后的主句的主语和谓语要使用部分倒装。同时，由于句子中出现了时间状语by now，说明在时态上应使用现在完成时。故A 正确。

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