单项选择题


A.extensions
B.ways
C.stretches
D.periods
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单项选择题
A.travelingB.goingC.judgingD.coming
A.traveling
B.going
C.judging
D.coming
单项选择题
A.to be worriedB.to worryC.to be worried aboutD.to worry about
A.to be worried
B.to worry
C.to be worried about
D.to worry about
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