鱼贯转向法适用于（）
A、单纵队转向
B、单横队转向
C、各种队形转向
D、以上说法都不对
参考答案：A
Mr. Smith_________ to an important meeting last night. [ ]
A. invites
B. invited
C. is invited
D. was invited
嗅觉检验
