单项选择题

We must abide by the rules.()

A. stick to
B. persist in
C. safeguard
D. apply

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单项选择题

The substance can be added to gasoline to accelerate the speed of automobiles.()

A. quicken
B. shorten
C. loosen
D. enlarge

单项选择题

We resolved the problem after group discussion.()

A. caused
B. met
C. solved
D. posed

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