Fish usually( ) fast in the river.A swim B is swimming c is swim c swims 选哪个

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Fish usually( ) fast in the river.A swim B is swimming c is swim c swims 选哪个
Fish usually( ) fast in the river.A swim B is swimming c is swim c swims 选哪个

Fish usually( ) fast in the river.A swim B is swimming c is swim c swims 选哪个
选A:swim
首先这句特别用了usually来强调是一般性陈述,所以是一般现在时,B排除.
C里面两个动词,直接无视.
D是一般现在时第三人称单数,可惜这里Fish是复数(fish单复数同形),如果用单数的话前面必然有冠词(a或者the).

选a 很显然这句话是陈述一个简单的事实,所以应该用一般现在时,而fish单复同行,作主语时,谓语动词要用复数,所以综合一下应该选A

A
鱼这个单词单复同形,这里强调一个事实,肯定不是一条鱼在河里有的快,从单复数讲直接就把BCD排出了。

选C