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 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。