---Where is Mr Wu, Millie?

--- I’m not sure. He be in his office.

A. must B. may C. can’t D. mustn’t

B 【解析】句意：—吳先生在哪兒，米莉？ —我不確定。他可能在辦公室里。A. must“一定”，表示肯定的推測(cè)；B. may“可能”，表示推測(cè)；C. can’t “不能”，表示否定的推測(cè)；D. mustn’t“千萬(wàn)不要”，表示禁止。由于用I’m not sure.說(shuō)明后句是表示一種不太有把握的推測(cè)。故選B。
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