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四.it类. Everyone knows that is dangerous to play with fire, but is difficult is t

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四.it类. Everyone knows that is dangerous to play with fire, but is difficult is t

四、it类

. Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.

A.it, itB.what, whatC.it, whatD.what, it

试题答案

D

解析