单项选择题


A．gathering
B．assembling
C．waiting
D．forming
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单项选择题
A．being perchedB．perchingC．being perchingD．be perched
A．being perched
B．perching
C．being perching
D．be perched
单项选择题
A．beforeB．previousC．agoD．former
A．before
B．previous
C．ago
D．former
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