Where did you __________ the movie? [ ]
A. watched
B. watching
C. to watch
D. watch
答案:D
--- This must be a footprint of a tiger.
--- It ____ be. A tiger’s should be much larger and deeper than this.
A.mustn’t
B.won’t
C.shan’t
D.can’t
被感染艾滋病病毒后后应该就地隔离。