Someaspectsofapilot'sjob beboring,andpilotsoften ...
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問題詳情:
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
【回答】
A
知識點:情態動詞
題型:選擇題
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