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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
情态动词 must 表推测时只能用于肯定句。在否定句中用 can’t 代替must。can’t 意为“不可能”;may not 意为“可能不”;be able to 表示经过努力或克服了困难之后做成了某事的能力,意为“能,会”。句中的破折号起解释说明的作用。“我几分钟前在公司见过他”,因此“不可能在上海”,故答案为 B。
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