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16. At that time they ____ very hard for the new project.

A. are working B. is working C. work D. were working

17. When we were out yesterday I suddenly remembered that I _____ the gas stove so I came back home.

A. didn’t turn off B. had not turned off C. not turned off D. wouldn’t have turned off

18. The police woman suggested the man ______ the gun and they could have a talk together.

A. drop B. to drop C. dropped D. dropping


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