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—Which is        , the sun, the moon or the earth?

—Of course the sun is.

A．smaller                   B．the smallest               C．bigger                 D．the biggest

-----Which is________, the sun, the moon or the earth ?

-----Of course the sun is.

A. smaller      B. the smallest      C. bigger      D. the biggest

---Which is ______, the sun, the moon or the earth?   ---Of course the sun is.

A．smaller

B．bigger

C．the biggest

D．the smallest