It wasn’t until Becky looked out of the window and couldn't see land that she realized the boat had set sail.
A.The ship had begun its journey, and Becky became aware of this only when she could see no land upon looking out of the window.
B.After becoming aware that the boat had left the dock, Becky went to look out of the window to watch as they journeyed.
C.Having looked out of the window and seen land, Becky wasn't sure whether the ship had started moving or not.
D.Since Becky couldn’t see out of the window, it was impossible for her to tell if the boat had begun its journey into open waters yet.

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