You must work hard( )English.A.on B.at C.A or B

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You must work hard( )English.A.on B.at C.A or B
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You must work hard( )English.A.on B.at C.A or B
You must work hard( )English.A.on B.at C.A or B

You must work hard( )English.A.on B.at C.A or B
A on
work hard on something
这是固定搭配,就是努力做某事