单项选择题


A.until
B.before
C.when
D.as
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单项选择题
A.practicalB.practicingC.practiceD.practised
A.practical
B.practicing
C.practice
D.practised
单项选择题
A.gatheringB.assemblingC.waitingD.forming
A.gathering
B.assembling
C.waiting
D.forming
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