your father needs to worry about your school work if you don't work hard.(保持句子原意)it( )( )( )your father to worry about your school work if you don't work hard.

问题描述:

your father needs to worry about your school work if you don't work hard.(保持句子原意)
it( )( )( )your father to worry about your school work if you don't work hard.

is necessary for