题目内容
【题目】Look! They (swim) in the river now.
【答案】are swimming
【解析】Look！是现在进行时的提示语，主语是 they，故填 are swimming。句意是：看！他们现在正在河里游泳。
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题目内容
【题目】Look! They (swim) in the river now.
【答案】are swimming
【解析】Look！是现在进行时的提示语，主语是 they，故填 are swimming。句意是：看！他们现在正在河里游泳。