Hardly to speak someone interrupted him.
A. had he begun; when
B. he had begun; while
C. did he begin; when
D. he begun; when
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(答案→)A. had he begun; when
B. he had begun; while
C. did he begin; when
D. he begun; when
解析：答案：A 考查倒装句。hardly...when...意为“一……就……”，当hardly置于句首时，句子要用部分倒装，由此可排除选项B和D；begin这一动作先于interrupted发生，由此应用过去完成时。故A项正确。