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Comrade Wang ________ be in Shanghai—I saw him in the company only a few minutes ago.
A．mustn’tB．can’tC．may notD．isn’t able to
B
情態(tài)動詞 must 表推測時只能用于肯定句。在否定句中用 can’t 代替must。can’t 意為“不可能”；may not 意為“可能不”；be able to 表示經過努力或克服了困難之后做成了某事的能力，意為“能，會”。句中的破折號起解釋說明的作用。“我?guī)追昼娗霸诠疽娺^他”，因此“不可能在上�！�，故答案為 B。
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