问题
.Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire
A:it, it
B:what, what
C:it, what
D:what, it
B:what, what
C:it, what
D:what, it
正确答案是：
同类题型
for the breakdown of the school computer network,Alice was in low spirits.
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