【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
在线课程【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。
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