问题
选择题
Despite the rising costs of many products, bus fares in the city of Zhuzhou ______ unchanged.
A．remain
B．are remained
C．are remaining
D．remains
答案
答案：A
考查remain的用法。Remain为系动词无被动和进行时的形式，故排除BC，该句主语为bus fares故排除D用remain。