问题补充：
---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
答案：
A. shall be
B. should have been
C. must be
D. might have been
解析：根据语境知道问现在在哪里，而第二句话是指我刚才见到他在教室里，由此可以肯定，她现在一定在教室里，是对现在的肯定推测。
