单项选择题


A.before
B.previous
C.above-going
D.former
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单项选择题
A.in advanceB.ahead ofC.in front ofD.in front
A.in advance
B.ahead of
C.in front of
D.in front
单项选择题
A.gatheringB.assemblingC.waitingD.forming
A.gathering
B.assembling
C.waiting
D.forming
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