All of us found _____necessary to keep the balance of nature.A.itB.thatC.thisD.one

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All of us found _____necessary to keep the balance of nature.A.itB.thatC.thisD.one
All of us found _____necessary to keep the balance of nature.
A.it
B.that
C.this
D.one

All of us found _____necessary to keep the balance of nature.A.itB.thatC.thisD.one
答案:A
it 在此作形式宾语,真正的宾语是后面的动词不定式 to keep the balance of nature,而其他的几个选项都不能作形式主语或者形式宾语,所以排除.

选A