---Hi, Tom. Do you have any idea where Jane is?
---She in the classroom. I saw her there writing her position just now.
A. shall be
B. could be
C. must be
D. might be
网友回答
A. shall be
B. could be
(答案→)C. must be
D. might be
解析：情态动词考查题，must表肯定推测。句意：汤姆你知道珍妮在哪吗？她一定在教室里刚才我看见她在那写作文。