some boys ______in the lake.应该填什么,是填are swimming还是 swimming
问题描述：
some boys ______in the lake.应该填什么,是填are swimming还是 swimming
答
some boys are swimming in the lake.还有一题，they are sitting and _____(talk)at a table，这个应该填什么？theyare sitttingandtalking ata table第二个问题为什么不用加 are?不用谢