10、Some aspeets of a pilot’s job__________be boring,and prilots often____________work at inconvenient hours.

A.can;have to        B.may;can       C.have to;may        D.ought to;must

10、A

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Some aspeets of a pilot’s job__________be boring,and prilots often____________work at inconvenient hours.

A.can;have to        B.may;can       C.have to;may        D.ought to;must

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