A duck swim in the river A./ B.is C.can 选择哪个A duck ( )swim in the river

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AduckswimintheriverA./B.isC.can选择哪个Aduck()swimintheriverAduckswimintheriverA./B.isC.can选择哪个Aduck()sw

A duck swim in the river A./ B.is C.can 选择哪个A duck ( )swim in the river
A duck swim in the river A./ B.is C.can 选择哪个
A duck ( )swim in the river

A duck swim in the river A./ B.is C.can 选择哪个A duck ( )swim in the river
can ,因为can是情态动词,后面的动词能跟原形