题目内容
(请给出正确答案)
[单选题]
They are the private companies () mostly on profits.
A、concentrating
B、to be concentrated
C、to concentrate
D、had concentrate
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B、to be concentrated
C、to concentrate
D、had concentrate
B.largest private
C.first public
D.largest public
A.public
B.private
C.local area
D.wide area
A.错误
B.正确