---Who’s the woman in red ? Is it Mrs. White?---It be her. She went to Beijing yesterday.A

问题补充：

---Who’s the woman in red ? Is it Mrs. White?

---It be her. She went to Beijing yesterday.

A. mustn’t

B. can’t

C. shouldn’t

D. must

答案：

A. mustn’t

(答案→)B. can’t

C. shouldn’t

D. must

解析：根据She went to Beijing yesterday.可知，本句应该是“不可能是她”故排除D；mustn’t表示禁止做某事；shouldn’t表示不应该，都与题意不符，故排除；can’t表示“不可能”。所以本题选B。