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
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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
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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