单项选择题

Water ______to make crops grow in dry places.

A．needs
B．need
C．is needed
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单项选择题
The man assured himself that the bridge was safe before ______it.
A．cross
B．acrossing
C．crossing
单项选择题
Young people choose to live their own lives, ______they are old enough.
A．even though
B．because
C．once
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