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
B
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。
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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