Children under sixteen are not permitted to participate in such kind of activities _____ bad for their mental development.A.as isB.as areC.that areD.that they are
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A解析考察句型，根据such可知，后面可以使用such ……as+不完整句子 such ……that+完整句子，因此排除C,such kind of activities后面的谓语动词应当根据kind，所以排除BD，选择A