问题描述：
They tried to restrict access to __ they believed to be dangerous areas.
They tried to restrict access to ________ they believed to be dangerous areas.
A) what
B) which
C) that
D) everywhere
为什么A不行.
They tried to restrict access to ________ they believed to be dangerous areas.
A) what
B) which
C) that
D) everywhere
为什么A不行.
问题解答：
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