单项选择题

He is (certain) that the dictionary is just what 1 want．

A．sure
B．angry
C．doubtful
D．worried
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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
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
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