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【題目】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】前面考查情態(tài)動詞can的推測用法，表示理論上的可能性；后面考查情態(tài)動詞have to的本義，表示客觀事實的限制。

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