look up sth还是look sth up

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lookupsth还是looksthuplookupsth还是looksthuplookupsth还是looksthuplooksth,up才对,而且sth,如果是人称代词,需要用宾格.

look up sth还是look sth up
look up sth还是look sth up

look up sth还是look sth up
look sth,up才对,而且sth,如果是人称代词,需要用宾格.