单项选择题
A.being perched
B.perching
C.being perching.
D.be perched
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单项选择题
A.gatheringB.assemblingC.waitingD.forming
A.gathering
B.assembling
C.waiting
D.forming
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单项选择题
A.SwarmsB.HerdsC.FlocksD.Schools
A.Swarms
B.Herds
C.Flocks
D.Schools
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