Fill in the blank with the appropriate form of the verb.1. He was low-spirited and even considered (go) away.
1. The goods _____________ when we arrived at the airport.
A. were just unloading
B. had just been unloading
C. had just unloaded
D. were just being unloaded
下列药物中可用重氮化-偶合反应及三氯化铁反应进行鉴别的是( )
A. 阿司匹林
B. 对氨基水杨酸钠
C. 青霉素
D. 盐酸普鲁卡因
E. 对乙酰氨基酚