1. 다음 문장 중 어법상 가장 적절한 것은?

  • 1
    Only when she left the party did he arrived there.

  • 2
    He constantly feels he has to prove himself to others.

  • 3
    They will keep their customers’ personal informations private.

  • 4
    By the time you came back here, she will have left for her country.
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