单项选择题

We will set off after he finishes packing.

A．set out
B．set back
C．set up
D．set down
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单项选择题
The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
A．continuously
B．quickly
C．excessively
D．exceptionally
单项选择题
Can you account for your absence from the class last Thursday
A．explain
B．examine
C．excuse
D．expand
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