综合训练8单项填空21. What _ public is concerned about is whether medical workers and scientists will be able to find for this new disease in a short time.A.不填;不填 B.不填;the C. the;不填 D. the; a22._ good, these cookies sell well.A. Smelled B. Smelling C. Being smelled D. To smell23.- Havent I told you that I like the beef well done? -Yes, but I _ it longer than I usually do.A. was cooking B. will cook C. cooked D. had cooked24. We ve p