单项选择题
A.off
B.in
C.for
D.hack
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单项选择题
A.on and onB.by and byC.downD.over
A.on and on
B.by and by
C.down
D.over
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单项选择题
A.interestedB.tiredC.angryD.surprised
A.interested
B.tired
C.angry
D.surprised
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