问题补充：
got on the train when it started to move.
A. Scarcely I had
B. Scarcely had I
C. No sooner I had
D. No sooner had I
答案：
A. Scarcely I had
B. Scarcely had I
C. No sooner I had
(答案→)D. No sooner had I
解析：考查倒装句：scarcely/hardly had Sb done when….,No sooner had sb done than….一….就….,因为连词是than，所以选D，句意是：我一上火车，火车就开了。选D。
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