___is very important ___the envioronment around us A this to protect B it to protectC that protecting D it protecting

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___isveryimportant___theenvioronmentaroundusAthistoprotectBittoprotectCthatprotectingDitprotecting__

___is very important ___the envioronment around us A this to protect B it to protectC that protecting D it protecting
___is very important ___the envioronment around us A this to protect B it to protect
C that protecting D it protecting

___is very important ___the envioronment around us A this to protect B it to protectC that protecting D it protecting
答案:B
it在句中作形式主语,动词不定式作真正的主语.

B it to protect

B it to protect

固定结构 It is +形容词 +to do sth , 所以选B