How far is the airport?it is about____.a)alf an hour's walk b)half an hours c)half an hours' walk d)half-an-hour walk选哪个,最好有为什么

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How far is the airport?it is about____.a)alf an hour's walk b)half an hours c)half an hours' walk d)half-an-hour walk选哪个,最好有为什么
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How far is the airport?it is about____.a)alf an hour's walk b)half an hours c)half an hours' walk d)half-an-hour walk选哪个,最好有为什么
How far is the airport?it is about____.
a)alf an hour's walk b)half an hours c)half an hours' walk
d)half-an-hour walk
选哪个,最好有为什么

How far is the airport?it is about____.a)alf an hour's walk b)half an hours c)half an hours' walk d)half-an-hour walk选哪个,最好有为什么
A
an hour为单数
加了个half还是单数
所以用's

第四个 half-an-hour 属形容词一小时半的