— Hi, Tom．Any idea where Mary is? ．
一 She in the reading room．I saw her there just now．
A. shall be
B. should have been
C. should be
D. might have been
网友回答
A. shall be
B. should have been
(答案→)C. should be
D. might have been
解析：
这题考查情态动词的用法：这是对现在情况的猜测，所以排除B和D，这里是根据I saw her there just now．推理出她应该在阅览室。Should表示按道理应该，选C。