单项选择题

A．in advance
B．ahead of
C．in front of
D．in front
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单项选择题
A．being perchedB．perchedC．being perchingD．be perched
A．being perched
B．perched
C．being perching
D．be perched
单项选择题
A．whyB．whenC．howD．what
A．why
B．when
C．how
D．what
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