填空题 (Hardly he had) entered (the office) when he realized (that he) (had forgotten) his wallet. A. Hardly B. the office C. that he D. had forgotten
  • 1、
【正确答案】 1、D改为he forgot。    
【答案解析】Hardly... when结构中，主句用过去完成时，从句用一般过去时。