摘要：21．The missing boy was last seen near the river. [ ] A．to be playing B．play C．to play D．playing
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The missing boy was last seen ________ near the river with a young tall man.
[ ]
A．playing
B．played
C．to play
D．to be playing
The missing boy was last seen ________ near the river．
[ ]
A．playing
B．to be playing
C．play
D．to play
The missing boy was last seen ________ near the river.
[ ]
A．playing
B．to be playing
C．play
D．to play