During the period of recent terrorist activities, people _____ not to touch an unattended bag．
A．had always been warnedB．were always being warned
C．a(chǎn)re always warningD．a(chǎn)lways warned
B
考查時(shí)態(tài)。這里用過(guò)去進(jìn)行時(shí)表示過(guò)去某個(gè)時(shí)候經(jīng)常性的動(dòng)作。
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