1. Gold _______________ in California in the nineteenth century. A. was discovered B. has been discovered C. was discovering D. discovered 2. All the luggage _______________ before departure. A. will have checked B. will has checked C. will be checked D. will checked 3. Where did you get these old dresses? They _______________ in the old trunk accidently. A. were found B. were finding C. have been found D. found 4. The preparations _______________ by the time the guests arrived. A. had been finished B. have been finished C. have finished D. had finished 5. “Where is the old chicken coop?” “It _______________ by a windstorm last year.” A. destroys B. is destroyed C. was destroyed D. destroyed ( giải tích sao chọn câu đó lun nha )