Look,boy_____in the lake.A.swim B.swims C.is swiming D.is swimming ( )
问题描述：
Look,boy_____in the lake.A.swim B.swims C.is swiming D.is swimming ( )
答
选D.look表明是现在进行时,要用-ing形式,swim的现在分词形式是swimming,所以选D!