Tom did all _______ he could to get on well _______ his classmates. [ ]

A. which; with

B. that; /

C. that; with

D. /; /

患儿，男，7岁。咳嗽1周，喘3天，无发热。门诊就诊

哪项检查对诊断有帮助

A．血常规

B．病毒分离

C．X线正位片

D．冷凝集试验

E．OT试验