---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;B. may“可能”,表示推測;C. can’t “不能”,表示否定的推測;D. mustn’t“千萬不要”,表示禁止。由于用I’m not sure.說明后句是表示一種不太有把握的推測。故選B。
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