21、During the period of recent terrorist activities, people _______ not to touch any unattended bag.

A. had always been warned                     B. were always being warned

C. are always warning                             D. always warned

21、B

解析：本題考查時(shí)態(tài)和語(yǔ)態(tài)，首先我們要判斷時(shí)態(tài)。意思是在最近恐怖活動(dòng)的這段時(shí)間里，人們一直被提醒不要去碰那么丟棄的包。所以，表達(dá)的是在一段時(shí)間里一直做某事，完成時(shí)可以表達(dá)這個(gè)含義，或者是進(jìn)行時(shí)和一段時(shí)間聯(lián)用也可以表達(dá)這個(gè)含義。有的同學(xué)可能會(huì)選擇A，但是我們沒(méi)法確定用過(guò)去完成時(shí)，因?yàn)檫^(guò)去完成時(shí)是不能單獨(dú)使用的。應(yīng)該是現(xiàn)在完成時(shí)。但是沒(méi)有，所以我們只有選擇B。

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