A clock must above all keeps good time.keeps是不是应改为keep?

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A clock must above all keeps good time.keeps是不是应改为keep?

A clock must above all keeps good time.keeps是不是应改为keep?
A clock must above all keeps good time.keeps是不是应改为keep?

A clock must above all keeps good time.keeps是不是应改为keep?
是的 must是情态动词 后应跟动词原形 keep 而above all 是插入语 可换做 Above all,a clock must keep good time.

不是。主语是A clock 所以用第三人称单数形式keeps

yes
keeps -> keep

不应改
主语A clock是第三人称单数