问题
________ when the door burst ______.
A:Hardly did he collect the papers on his desk; opened
B:No sooner had he collected the papers on his desk; opened
C:Hardly had he collected the papers on his desk; open
D:No sooner did he collect the papers on his desk; open
B:No sooner had he collected the papers on his desk; opened
C:Hardly had he collected the papers on his desk; open
D:No sooner did he collect the papers on his desk; open
正确答案是：
