i must work hard on english.短文改错,为什么要把ON改成AT?i must work hard on english.短文改错,为什么要把ON改成AT?The young man came riding full speed down the road on his bicycle._______it was!A how dangerous the sceneB what dang

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i must work hard on english.短文改错,为什么要把ON改成AT?i must work hard on english.短文改错,为什么要把ON改成AT?The young man came riding full speed down the road on his bicycle._______it was!A how dangerous the sceneB what dang
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i must work hard on english.短文改错,为什么要把ON改成AT?i must work hard on english.短文改错,为什么要把ON改成AT?The young man came riding full speed down the road on his bicycle._______it was!A how dangerous the sceneB what dang
i must work hard on english.短文改错,为什么要把ON改成AT?
i must work hard on english.
短文改错,为什么要把ON改成AT?
The young man came riding full speed down the road on his bicycle._______it was!
A how dangerous the scene
B what dangerous a scene
C how dangerous scene
D what a dangerous scene

i must work hard on english.短文改错,为什么要把ON改成AT?i must work hard on english.短文改错,为什么要把ON改成AT?The young man came riding full speed down the road on his bicycle._______it was!A how dangerous the sceneB what dang
因为work at 是固定词组 从事 某项 工作
而work on 也是固定词组 意思是 对.发生作用
on如果是副词 是 继续工作
本句意思 我必须用功学英语 所以 只能用 work hard at

这是个固定搭配 work hard at.....努力学习，致力于。。。。

at 有在某一方面的意思，比如有词组是be good at, be bad at等，
on 是在什么上面的意思

I must work hard 是什么意思 At work,I must work hard I wish myself a happy birthday. From now on, I must work hard. Fight for democracy.什么意思 We must ( )(work)hard. this is ____ ,so we must ____ on it.A.a hard work;hard work B.hard work;work hardC.hard work;hard work D.a hard work;work hard Don't want to weigh down again.I must work hard.The dignity of my parents is on my shoulder. I must work hard ___a student 填哪个介词? I know deeply,must continue to work hard.中文翻译! Plentig tree is_____.I must help you.A hard work B a hard work work hard in 还是work hard on i must work hard on english.短文改错,为什么要把ON改成AT?i must work hard on english.短文改错,为什么要把ON改成AT?The young man came riding full speed down the road on his bicycle._______it was!A how dangerous the sceneB what dang for you,for me,for our future---you must work hard ,I must study hard中文是什么这些英文是什么 I found it was hard to finish the hard work on time改为同意句I found （ ）hard （ ）（ ）the hard work on time You must work hard( )English.A.on B.at C.A or B I am w_____ in Chinese.I must work hard at it. I'm not good at G_______,so i must work hard. it found it was hard to finish the hard work on time同一句I found 什么 hard 什么什么the hard work on time To finish the job is ___ .You must ___ .A.hard work;hard workB.work hard:work hardC.hard work:work harkD.a hard work;work hard