问题
选择题
Because so many visitors are visiting our school today, some teachers have to _______ guides.
A．serve as
B．regard as
C．treat as
D．use as
答案
答案：A
词义辨析. A. 担任;充当 B. 把……认着 C. 对待；把……看做 D. 把……当做……使用。句意：因为今天有如此多的参观者来我们学校参观，一些老师不得不充当向导。选A。