The experts were doing their experiment in the lab, ______ what happened outside. [ ]

A. didn't know

B. not knew

C. not knowing

D. having not known

糖皮质激素联用白三烯受体阻断剂 （）

A.有协同作用，可减少糖皮质激素用量

B.增加胃溃疡概率

C.钾过度流失

D.血糖升高

E.血钾升高