Measures have to be taken to teach young people how to themselves both in family and in

问题补充：

Measures have to be taken to teach young people how to themselves both in family and in school. They don’t know the basic manners.

A. do

B. perform

C. behave

D. work

答案：

A. do

B. perform

(答案→)C. behave

D. work

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