I am working hard ( )French.A.at B.for C.in D.on

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I am working hard ( )French.A.at B.for C.in D.on
I am working hard ( )French.A.at B.for C.in D.on

I am working hard ( )French.A.at B.for C.in D.on
选D
work on表示致力于.

A

work hard at...在某方面很努力

on
work on 从事
我很认真学法语

D
I am working hard (on )French
我努力学习法语
work hard on seh 努力做某事
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A.at