问题描述：
Knowing how long the text would last,the students who finished( )back and waited .
Knowing how long the text would last,the students who finished( )back and waited until the end of the exam.
A settle Bsetted C settling D to settle
Knowing how long the text would last,the students who finished( )back and waited until the end of the exam.
A settle Bsetted C settling D to settle
问题解答：
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