单选题 Hardly had the thief seen the policeman than he ran away.
A. had B. seen C. than D. ran

【正确答案】 C
【答案解析】[解析] than→when。否定副词或含有否定意义的词组置于句首时，句子要倒装。其中，hardly…when…，no sooner…than…为固定搭配。