注意：此页面搜索的是所有试题
题目内容
（陇东学院-大学英语2(专升本)）
38. (单选题) Many firms are _________ on increasing their markets overseas.(本题1.0分)
A、 fixing
B、 fitting
C、 mixing
D、 concentrating
A、 fixing
B、 fitting
C、 mixing
D、 concentrating
参考答案
