___isveryimportant___theenvioronmentaroundusAthistoprotectBittoprotectCthatprotectingDitprotecting
2022-04-30 39次 反馈错误 加入收藏 正确率 : 100%
题目内容：
___is very important ___the envioronment around us A this to protect B it to protect
C that protecting D it protecting
优质解答
答案：B
it在句中作形式主语,动词不定式作真正的主语.
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