单项选择题

7 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
A research center has been set up in this country.
A. praised
B. established
C. reformed
D. criticized
单项选择题
Their parents once lived under very severe conditions.
A. sound
B. hard
C. strict
D. tight
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