单项选择题

A．fall
B．leak
C．drain
D．disposal
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单项选择题
A．promptlyB．preciselyC．urgentlyD．permanently
A．promptly
B．precisely
C．urgently
D．permanently
单项选择题
A．whenB．thatC．whichD．where
A．when
B．that
C．which
D．where
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