单项选择题

Enormous sums of money have been spent on space exploration.

A. Much
B. Large
C. Small
D. Fixed
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单项选择题
7 The researchers have just completed a study of driving situations.
A. started
B. finished
C. changed
D. made
单项选择题
A research center has been set up in this country.
A. praised
B. established
C. reformed
D. criticized
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