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
英语人气：580 ℃时间：2019-11-04 05:39:11
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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
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