单项选择题

_____the children to bed, she began to correct the students’ exercises.

A．Sending　
B．Being sent　
C．sent　
D．Having sent
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单项选择题
The huge fire is reported to have _______ more than 300 people dead.
A．remained　
B．kept　
C．left　
D．had
单项选择题
As time went on, the theory she had stuck ________ correct .
A．proved
B．to proving
C．to proved
D．to prove
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