If he _____ here, that would be very good. [ ]
A. is
B. was
C. were
D. has been
答案:C
对哮喘持续状态的处理哪一项是错误的
A.吸氧
B.补液纠正酸中毒
C.糖皮质激素类静脉滴注
D.支气管扩张剂
E.脱敏疗法
生物操纵