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[单选题]
According to statistics, America's skilled white-collar work force has_____the ranks of skilled blue-collar workers for the first time.
A.overweighed
B.overtake
C.overlooked
D.overspread
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A.overweighed
B.overtake
C.overlooked
D.overspread
A.HUMAN
B.ANIMATE
C.MALE
D.ADULT
A.Too much training
B.Frequent absence
C.Very little concentration
A.The system of sounds
B.The system of words
C.The system of grammar.
D.The system of syntax