问题
选择题
The Chinese improve the environment in China ______. [ ]
A. in 1990s
B. in the 1990
C. in the 1990s
D. in 1990 year
答案
答案：C
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The Chinese improve the environment in China ______. [ ]
A. in 1990s
B. in the 1990
C. in the 1990s
D. in 1990 year
答案：C