–Hi, Tom. Any idea where Jane is?
--She in the classroom. I saw her there just now.
A. shall be
B. should have been
C. must be
D. might have been
网友回答
A. shall be
B. should have been
(答案→)C. must be
D. might have been
解析：考查情态动词表推测的用法。句意为：——你好，汤姆。知道简在哪里吗？——她一定在教室里，我刚才看见她在那里。B项和D项表示对过去事情的推测，shall be则表示将来。故选c。