25．If you sleep short of 7 hours, you are three times to catch a cold．
A. possible
B. certainly
C. probable
D. likely
网友回答
A. possible
B. certainly
C. probable
(答案→)D. likely
解析：考查形容词。three times是修饰词语，若将其去掉，则可将A、C项排除。因为possible和probable的主语不能是具体的人或物。B项是副词不能做表语，故选D。