air keeps people ( )a.live b.lived c.alive d.living

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airkeepspeople()a.liveb.livedc.alived.livingairkeepspeople()a.liveb.livedc.alived.livingairkeepspeop

air keeps people ( )a.live b.lived c.alive d.living
air keeps people ( )a.live b.lived c.alive d.living

air keeps people ( )a.live b.lived c.alive d.living
c. alive
空气让人们活着

d

d

alive

选d

a

d.

keep,在这里是全义动词。可能的选择只有c.和d.

ing形式 本身既有“持续不断”的含义。

keep doing 是固定用法:意思是“持续不断地做某事”。
和stop doing 用法类似。

live 是不及物动词,无须宾语。

hello there.

key: air keeps people alive.语法是keep sb doing sth or keep sb adj

比较如下:air keep s people alive.
air keeps people living on the Earth.
air keeps people breathe free lived at the land.