the boys are ()in the river 现在进行时。
Look!Theboys________happilyintheriver．A.swimB.swamC.willswimD.areswimming...
Look!The boys ________ happily in the river．
A.swim
B.swam
C.will swim
D.are swimming 展开
A.swim
B.swam
C.will swim
D.are swimming 展开
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