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  3. Every boy and girl______not to swim in the lake, for it is polluted.

Every boy and girl______not to swim in the lake, for it is polluted.

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问题 Every boy and girl______not to swim in the lake, for it is polluted.
选项 A、has been warned
B、have been warned
C、has warned
D、have warned
答案A
解析 句子的主语every boy and girl(每一个男孩和女孩)是单数形式，且它与句子谓语动词warn之间是动宾关系，所以应该用被动形式。故选A。
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