单项选择题

The word's supplies of petroleum __

A．are gradually exhausted
B． are being gradually exhausted
C．have been gradually being exhausted
D．have gradually exhausted
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单项选择题
My husband's arm got hurt __ the iron tower
A．while we were climbing up
B．while he is climbing up
C．while he climbed up
D． while we climbed up
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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