选b
一个半小时（即90分钟）,有多种表达方式：one and a half hours,one hour and a half或者an hour and a half都可以.因为一个半小时超过了一个小时,所以one and a half后面跟复数hours,而one后面是hour,加单数,加上 and a half.
the boy always stays here for(?) a.one and a half hour b.one
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