问题补充:
--- Why is Jenny still standing there? It’s so cold.
—She for someone.
A. can wait
B. might have waited
C. must be waiting
D. should have waited
答案:
A. can wait
B. might have waited
(答案→)C. must be waiting
D. should have waited
解析:考查情态动词中时态的使用。根据上文可知是在描述现在的动作,因此用情态动词+进行时,同时考查情态动词的含义,表示有把握的推测用must。