中文谷Someaspectsofapilot'sjob beboring,andpilotsoften ...
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问题详情：
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
知识点：情态动词
题型：选择题
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