题目内容
During the period of recent terrorist activities, people ________ not to touch an unattended bag.
[ ]
A.had always been warned
B.were always being warned
C.are always warning
D.always warned
答案:B
解析:
解析:
|
考查时态。这里用过去进行时表示过去某个时候经常性的动作。 |
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