Not until _____,_______the diffiult problem.[ ]

A.did he return;we settled

B.he returned;we settled

C.did he return,did we settle

D.he returned;did we settle.

患儿，9个月。腹泻3天，症见鼻塞流涕，哭时有泪，每日排便10余次，呈稀水样，无腥臭味。体格查体：体温38.2℃，听诊心肺正常，肠鸣音亢进，苔薄白。其诊断可能是

A．病毒性肠炎风寒证
B．细菌性肠炎风寒证
C．真菌性肠炎风寒证
D．细菌性肠炎湿热证
E．病毒性肠炎湿热证