问题
选择题
112. In all, 57 such trains are expected to be in ____ commercial operation by _____ end of 2009.
A．the; the
B．a; a
C．/; the
D．a; the
答案
C
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112. In all, 57 such trains are expected to be in ____ commercial operation by _____ end of 2009.
A．the; the
B．a; a
C．/; the
D．a; the
C