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I’ve never seen anyone run so fast- David go. [ ] A.just watch B.just to watch C

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I’ve never seen anyone run so fast- David go. [ ] A.just watch B.just to watch C

I’ve never seen anyone run so fast-________ David go.

[]

A.just watch

B.just to watch

C.just watching

D.just having watched

试题答案

答案:A

解析:

根据句意判断,此句是一个祈使句,所以用动词原形。