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

A. just watch      B. just to watch     C. just watching     D. just having watched

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

A. just watch      B. just to watch        C. just watching     D.just having watched

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

A. just watch

B. just to watch

C. just watching

D. just having watched

A. just watch

B. just to watch

C. just watching

D. just having watched