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

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Susandidlotsofresearch()thatsubjectlastmonthfor.On.In.At.填哪个Susandidlotsofresearch()thatsubjectlastm

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

Susan did lots of research ()that subject last monthfor. On. In. At.填哪个
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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第一个。。。。。

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