________ the city.s environment(环境) has become of great importance. A.The improving B.Improving of C.Improving D.Being improved

________ the city.s environment(环境) has become of great importance.

A.The improving
B.Improving of
C.Improving
D.Being improved

出自：河南师范大学-学前教育（专科）-大学英语I

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