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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 |
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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 |
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