【正确答案】 B

【答案解析】[解析] 倒装句题。“no sooner…than”, “hardly…when”和“scarcely…before”相当于“as soon as”之意。当hardly, scarcely和no sooner置于句子之首时，语气较强，主句的谓语要部分倒装。例如：①We had hardly begun when we were told to stop. ②Hardly had we begun when we were told to stop. ③The spy had no sooner returned home than he was told to go to another country. 因此Hardly与选项B刚好相配，为正确选项。