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takes nearly 30 years for the planet Saturnto complete one orbit.A.ThatB.AsC.Whi

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takes nearly 30 years for the planet Saturnto complete one orbit.A.ThatB.AsC.Whi

________takes nearly 30 years for the planet Saturn(土星)to complete one orbit.

A.That

B.As

C.Which

D.It

试题答案

D

不定式短语to complete one orbit为真正主语,被形式主语 it替代。