问题标题:
Samwantedtogouptothemanbutsuddenlyhe_____thattherewasnoneinthehouse.foundoutnoticedsawknew
问题描述:

Samwantedtogouptothemanbutsuddenlyhe_____thattherewasnoneinthehouse.

foundout

noticed

saw

knew

蒋外文回答:
  noticed注意到
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