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A．so old
B．very old
C．old enough
D．too old
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单项选择题A．withB．becauseC．sinceD．thanks to

A．with
B．because
C．since
D．thanks to

单项选择题A．becauseB．so thatC．asD．in order that

A．because
B．so that
C．as
D．in order that