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闰年的条件是年号(year)能被4整除,但不能被100整除,或者能被400整除。则闰年的布尔表达式为()
A.
(year mod 4=0 and year mod 100<>0) and (year mod 400=0)
B.
(year mod 4=0 and year mod 100<>0) or (year mod 400=0)
C.
(year mod 4=0 or year mod 100<>0) and (year mod 400=0)
D.
(year mod 4=0 or year mod 100<>0) or (year mod 400=0)