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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

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

 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

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

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．a(chǎn)re always warning                       D．a(chǎn)lways warned

During the period of recent terrorist activities, people _____ not to touch and unattended bag.