31. (单选题) Our country’s iron and steel industry （） very rapidly for about 20 years . (本题1.0分) A、 have been developing B、 has been developing C、 have being developed D、 has being developed

31. (单选题)
Our country’s iron and steel industry （） very rapidly for about 20 years .

(本题1.0分)
A、 have been developing
B、 has been developing
C、 have being developed
D、 has being developed

出自：河南城建学院大学英语四

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