问题
选择题
______ in the school regulation that students shouldn’t use cell phones in the campus．
A．What requires
B．What is required
C．It requires
D．It is required
答案
答案：D
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______ in the school regulation that students shouldn’t use cell phones in the campus．
A．What requires
B．What is required
C．It requires
D．It is required
答案：D