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：考查情态动词用法。此处语境为问Jane，现在在哪里，故选C;防止误选D.
