问题
选择题
During the period of recent terrorist activities, people _____ not to touch and unattended bag.
A．had always been warned
B．were always being warned
C．are always warning
D．always warned
答案
B
考查固定句型用法。Be alawys doing sth.一直在做某事，表示赞赏或埋怨的感情色彩，此处从unattended bag.排除A，C，依据warn的用法，人们应该被警告，故选B。