问题描述：
Last Sunday Alice did some cleaning for ____.
A.two and a half hours B.two and half hour C.two and half hours D.two hour and a half
望好心人能顺便说明解题原因,
A.two and a half hours B.two and half hour C.two and half hours D.two hour and a half
望好心人能顺便说明解题原因,
问题解答：
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