题干
Unfortunately, when I dropped in, Doctor Li _______ for Beijing to join in the fight again SARS, so we only had time for a few words.
A：just left
B：has just left
C：is just leaving
D：was just leaving
答案(点此获取答案解析）
D
)有多种同分异构体，其中属于酯类，且分子结构中含有甲基和苯环的异构体有（ ）