112. In all, 57 such trains are expected to be in commercial operation by end of 2009.A.

发布时间：2020-08-16 07:09:05


112. In all, 57 such trains are expected to be in      mercial operation by      end of 2009.
A. the; the
B. a; a
C. /; the
D. a; the

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A. the; the
B. a; a
C. /; the
D. a; the
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