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
(答案→)C. must be
D. might have been
解析：本题回答语的含义是我刚才在教室里看到他，所以他一定在教室里，猜测的可能性应该是最大，用must来表示，故本题选C。
