单项选择题


A.feed
B.are fed
C.eat
D.rely
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单项选择题
A.beforeB.previousC.above-goingD.former
A.before
B.previous
C.above-going
D.former
单项选择题
A.in advanceB.ahead ofC.in front ofD.in front
A.in advance
B.ahead of
C.in front of
D.in front
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