问题补充：
We arrived on the platform just as the train was.
A. pulling up
B. pulling down
C. pulling out
D. pulling into
答案：
A. pulling up
B. pulling down
(答案→)C. pulling out
D. pulling into
解析：本题考查动词短语。句意：火车正要出站时，我们到了站台。pullout(车辆)驶出；pullup使停下；
pull into进入;到达；pull down拆毁，拉倒。
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