He wants to pass the English exam.So he works hard ____ it.

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He wants to pass the English exam.So he works hard ____ it.

He wants to pass the English exam.So he works hard ____ it.
He wants to pass the English exam.So he works hard ____ it.

He wants to pass the English exam.So he works hard ____ it.
用at
work hard at 努力学习……[固定词组]

for 为... 表示目的

on

at

for 原因: for在这里的意思就是 : 对学习勤奋!

for 表示原因啊.

on/for

on表示在这方面下功夫 for表目的

on表示在这方面下功夫 for表目的
支持这个