When I saw them last time,they were working ___ the farm.A at B in C by D on

When I saw them last time,they were working ___ the farm.A at B in C by D on
应该选哪个?为什么?
英语人气:558 ℃时间:2019-12-10 03:22:02
优质解答
D on
on the farm 在农场 ,固定搭配.
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