Children under sixteen are not permitted to participate in such kind of activities bad for their mental development.
A. as is
B. as are
C. that are
D. that they are
网友回答
(答案→)A. as is
B. as are
C. that are
D. that they are
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