Question

【题目】—Who______ it be that is knocking at the door?

—It ______ be Father, but I’m not sure.

A. can; must B. can; may

C. must; can D. may; must

Answer 1

【答案】B

【解析】

试题分析：考查情态动词。句意：正在敲门的会是谁呢？有可能是爸爸，我不确定。Can表示猜测，根据后面but I’m not sure 可知不确定，用may be可能是，故选B项。