________ 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

电杆基坑回填土施工做法正确的是（）

A.严禁采用冻土块及含有机物的杂土

B.同填时应将结块干土打碎后方可回填，回填应选用干土和湿土的拌合物

C.回填土时每步同壤土500mm，经夯实后再回填下一步，松软土应增加夯实遍数，以确保回填土的密实度

D.回填土夯实后应留有高出地坪300mm的防沉士台，在沥青路面或砌有水泥花砖的路面不留防沉土台

E.在地下水位高的地域如有水流冲刷埋设的电杆时，应在电杆周围埋没芷桩并以石块砌成水围子