–Thereisalotofsmokecomingoutoftheteachingbuildingthere...

问题详情：

 –There is a lot of smoke coming out of the teaching building there.

        --Really? It ______ be a fire, most probably.

         A. can           B. ought to         C. may            D. must

【回答】

B

知识点：情态动词

题型：选择题