[单选题,6分] ________ the city.s environment(环境) has become of great importance. A.The improving B.Improving of C.Improving D.Being improved

[单选题,6分] ________ the city.s environment(环境) has become of great importance.
A.The improving
B.Improving of
C.Improving
D.Being improved

出自：安阳师范学院—大学英语

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