Thirty minutes is h____ an hour.

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Thirty minutes is h____ an hour.

Thirty minutes is h____ an hour.
Thirty minutes is h____ an hour.

Thirty minutes is h____ an hour.
half /ha:f/ 一半,二分之一
该句的意思:30分钟是半小时/半小时等於30分钟
所以----中只要填alf就ok了

half