[题目]The headmaster be in the office because the light is on.A. can’t B. might C. could D. must 题目和参考答案——青夏教育精英家教网—

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【题目】The headmaster ____ be in the office because the light is on.

A. can’t B. might C. could D. must

【答案】D

【解析】句意：校长一定在办公室，因为灯亮着。考查情态动词。情态动词中的must, can, could, may, might都表推测。其中must的可能性最大， could次之，may / might最小。否定推测用can’t；肯定推测must，could, may, might。根据后文the light is on，可知校长在办公室的可能性很大，故选D。

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