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    【题目】Some aspects of a pilot’s job ___ be boring, and pilots often ___work at inconvenient hours.

    A. can; have to

    B. may; can

    C. have to; may

    D. ought to; must

    【答案】A

    【解析】前面考查情态动词can的推测用法，表示理论上的可能性；后面考查情态动词have to的本义，表示客观事实的限制。

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