Susan did lots of research ()that subject last month

分类: 作业答案 • 2022-01-09 18:02:33

问题描述：

Susan did lots of research ()that subject last month
for.On. In.At.
填哪个

答

填 on
Susan did lots of research on that subject last month.
有关那个课题,苏珊上个月做了很多研究.
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