Don't you think important to protect our earth A.that B.how C.it D.this

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Don''tyouthinkimportanttoprotectourearthA.thatB.howC.itD.thisDon''tyouthinkimportanttoprotectourearthA

Don't you think important to protect our earth A.that B.how C.it D.this
Don't you think important to protect our earth A.that B.how C.it D.this

Don't you think important to protect our earth A.that B.how C.it D.this
C. it , 不定式作宾语补足语,为了避免头重脚轻,用it引导
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