——Hi Mike．Any idea where Mary is?——She in the classroom．I saw her there just now．A. shal

问题补充：

——Hi, Mike．Any idea where Mary 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：本题考查情态动词。考must对现在情况的推测。