单项选择题

He broke the world __________ for the 100 meters．

A．mark
B．level
C．standard
D．record
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单项选择题
It can not be __________ strongly emphasized that economy is the foundation of a country．
A．too
B．very
C．as
D．so
单项选择题
“What happened”“We __________ for an hour when the bus finally came”
A．waited
B．have waited
C．have been waiting
D．had been waiting
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