He works a factory while his father works a farmHe works___a factory while his father works ___ a farmA.in...in B.in...onC.at...in D.on...at原因

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He works a factory while his father works a farm
He works___a factory while his father works ___ a farm
A.in...in B.in...on
C.at...in D.on...at
原因

B ,在工厂里工作,所以用in
在农场上工作,农场是平面的,所以用on

B
固定用法 in a factory
on a farm

这里有一个固定形式的,work in 工作于哪里,答案A

B
都是固定用法
有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)