As mentioned_____in the annual general meeting, these observations raised many questions on the causes of insomnia.

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问题 As mentioned_____in the annual general meeting, these observations raised many questions on the causes of insomnia.

选项 A、previous
B、previously
C、preview
D、prevention

答案B

解析 空格内应填入修饰前面的动词mentioned的副词,因此选择previously.
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