单项选择题

The researchers have just completed a study of driving situations.

A．started
B．finished
C．changed
D．made
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单项选择题
In order to surviveman needs to consume food and water.
A．work
B．play
C．live
D．walk
单项选择题
A small number of firmshave stopped trading.
A．hotels
B．shops
C．restaurants
D．companies
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