They( )be polite to their parents.A should B may C maybe D couldn’t选什么?

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They( )be polite to their parents.A should B may C maybe D couldn’t选什么?
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They( )be polite to their parents.A should B may C maybe D couldn’t选什么?
They( )be polite to their parents.A should B may C maybe D couldn’t选什么?

They( )be polite to their parents.A should B may C maybe D couldn’t选什么?
A

A should 表示的是应该这么做

A 应该
B是可能
C是动词 后面不能加BE ,是病句。
D意思首先错误,不能够,不可以的意思