That must ____very convenient.
A. is
B. be
C. are
D. being
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It’s especially good when I’m ____ a business trip.
A. in
B. about
C. on
D. by
move的名词是____?
A. movenent
B. moved
C. mover
D. movement
combination的动词是____?
A. combine
B. combin
C. combining
D. combind
同方向相邻两架通过色灯信号机柱中心线之间或进(出)站信号机柱与通过色灯信号机柱中心线之间的一段线路称为()。
A. 闭塞分区
B. 区段
C. 区间
D. 枢纽