单项选择题
A.working
B.walking
C.exercising
D.breathing
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单项选择题
A.CertainlyB.NoC.FortunatelyD.Probably
A.Certainly
B.No
C.Fortunately
D.Probably
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单项选择题
A.inB.atC.fromD.to
A.in
B.at
C.from
D.to
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