问题补充：
David helps his mother with the housework every Saturday for about.
A. one and half hours
B. a half and an hour
C. an hour and half
D. one and a half hours
答案：
A. one and half hours
B. a half and an hour
C. an hour and half
(答案→)D. one and a half hours
解析：一个半小时应表达为:an hour and a half或one and a half hours。
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