单项选择题
A.on
B.in
C.to
D.along
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单项选择题
A.waitingB.watchingC.makingD.keeping
A.waiting
B.watching
C.making
D.keeping
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单项选择题
A.feedbackB.governorC.steamD.system
A.feedback
B.governor
C.steam
D.system
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