—Onmywaytothebookstore,IsawMaryhangingoutwithherfriend...

问题详情：

 —On my way to the bookstore, I saw Mary hanging out with her friends.

—It ____________be her. She has gone to Beijing.

A. can't                        B. mustn't                    C. might               D. could

【回答】

 A

知识点：情态动词

题型：选择题