作业帮The dog can,t( )on the see-saw.A.play B.is playing C.playing
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The dog can,t( )on the see-saw.A.play B.is playing C.playing
The dog can,t( )on the see-saw.A.play B.is playing C.playing
The dog can,t( )on the see-saw.A.play B.is playing C.playing
A
情态动词can后面加动词原形