单项选择题

The man assured himself that the bridge was safe before ______it.

A．cross
B．acrossing
C．crossing
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单项选择题
Young people choose to live their own lives, ______they are old enough.
A．even though
B．because
C．once
单项选择题
All of the stores are ______on Sunday evening.
A．close
B．shut
C．closing
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