.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 |
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.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 |