单项选择题

The secretary worked late into the night, ______ a long speech for the president. ( )

A．to prepare
B．preparing
C．prepared
D．was preparing
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单项选择题
Is this the ______ that you are late again ( )
A．season
B．cause
C．reason
D．excuse
单项选择题
He is sitting ______ of the car with the driver. ( )
A．in front
B．in the front
C．on the front
D．front
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