问题描述:
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答案是A.其他选项为什么不能选
inconvenient hours.A can,have to B may,can C have to ,may D ought to,must答案是A.其他选项为什么不能选
问题解答:
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