问题:
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.
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
参考答案: