单项选择题

How do you (account) for your absence from the class last Thursday

A．explain
B．examine
C．choose
D．expand
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单项选择题
About one (quarter) of the workers in the country are employed in factories．
A．third
B．fourth
C．tenth
D．fifteenth
单项选择题
The soldier (displayed) remarkable courage in the battle．
A．placed
B．showed
C．pointed
D．decided
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