some boys ______in the lake.应该填什么,是填are swimming还是 swimming

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someboys______inthelake.应该填什么,是填areswimming还是swimmingsomeboys______inthelake.应该填什么,是填areswimming还是sw

some boys ______in the lake.应该填什么,是填are swimming还是 swimming
some boys ______in the lake.应该填什么,是填are swimming还是 swimming

some boys ______in the lake.应该填什么,是填are swimming还是 swimming
some boys are swimming in the lake.

are siwiming

are swimming是正在进行时,swimming是主动形式。应该选are swimming

  are swimming 现在进行时