单项选择题
The U.S., generally acknowledged to be a step __ Britain on biofuel, has an estimated 600 stations that offer E85 (a fuel made of 85 percent bioethanol).
A.in excess of
B.in advance
C. ahead of
D.in front of
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单项选择题
America's early __ were attracted by the fertile land and varied climates it offered for farming.
A.settlers
B.inherents
C.residents
D.lodgers
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单项选择题
I am unable to __ what he is saying.
A.concentrate on
B.concentrate in
C.finish with
D.finish off
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