问题
选择题
American English has changed _______ the centuries. There are several reasons _____ this.
A．over, for
B．for, with
C．in, of
D．during, about
答案
答案：A
题目分析:考查介词用法。over+时间段表示“在…期间，直到…完了(或过后)”比如He stayed over Christmas；the reason for sth意思是“……的原因”， A选项正确。句意：几个世纪以来,美国英语发生了变化。为此有几个方面的原因。