问题补充：
got on the train when it began to move．
A. No sooner had I
B. I had no sooner
C. Hardly had I
D. I hardly had
答案：
A. No sooner had I
B. I had no sooner
(答案→)C. Hardly had I
D. I hardly had
解析：Hardly…when…/No sooner…than…句型表示“刚一……就……”，位于句首主句采用部分倒装语序。
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