Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.
A.it; what | B.what; what | C.what; it | D.it; 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; what | B.what; what | C.what; it | D.it; it |