因各种原因造成一个区段列车运行中断时,可在具备折返条件的车站办理(),维持其它区段列车运营。
参考答案:列车折返作业
24. It was at twelve o’clock___we finally arrived at the village____we spent our happy childhood.
A.that; that
B.when; that
C.when; what
D.that; where