Question

【题目】—Look! It ________________ be Kitty in the classroom.
—It ________________ be her. Because I saw her in the library a short time ago.
A.may; mustn't
B.can; can't
C.must; can't
D.mustn't; can

Answer 1

【答案】C
【解析】考查情态动词辨析。表示肯定推测用can't,故选C。