作业帮为什么:They picked up some rocks and put (them)in the spacesship,为什么要用them呢?
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为什么:They picked up some rocks and put (them)in the spacesship,为什么要用them呢?
为什么:They picked up some rocks and put (them)in the spacesship,为什么要用them呢?
为什么:They picked up some rocks and put (them)in the spacesship,为什么要用them呢?
them 是宾语代指rocks
them 代的是rocks