he hurt his leg,and was-------(able)to go to school

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he hurt his leg,and was-------(able)to go to school

he hurt his leg,and was-------(able)to go to school
he hurt his leg,and was-------(able)to go to school

he hurt his leg,and was-------(able)to go to school
he hurt his leg,and was unable to go to school.
他腿受伤了,所以不能去上学了.

unable

unable

un-是个前缀 表否定
其他类似的还有 dis-,in-(如dislike,inexpensive)
但各个词前缀不同,要记的
这里是unable