The focus groups for the new products will be fully______on the purpose and deta

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问题 The focus groups for the new products will be fully______on the purpose and details of it at the beginning of the orientation.

选项 A、assessed
B、briefed
C、ridiculed
D、exposed

答案 B

解析词汇：动词1．这是一道词汇题，选项均为动词。2．expose(暴露)要接介词to，语义上也不通顺，(D)选项排除。3 brief做主动态时，后接介词on，组成brief sb onsth(对某人做某物的说明)，焦点小组的人是听说明的对象，应使用被动语态，因此(B)为正确选项。

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