To be honest, if it were not for the fact that you ____ my close friend, I would not take such pains

to serve you. [ ]

A. were

B. are

C. had been

D. have been

下列中毒性细菌性痢疾的临床表现，错误的是（）

A.全身中毒症状

B.休克

C.中毒性脑病

D.代谢性酸中毒

E.代谢性碱中毒