A. improve the environment
B. to improve the environment
C. improving the environment
D. improved the environment
A. how long can I keep the books B. how long I can keep the books
C. when should I return the books D. when I should return the books
A. Anything B. Something C. Nothing D. Other things
A. can B. have to
C. should D. need
A. B.
C. D.
A. 统一度量衡、货币 B. 焚书坑儒
C. 统一文字 D. 建立中央集权制度
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