简答题
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试题题干

Correct errors in the following sentences:​A river usually begins far up in the mountains or hill.

参考答案

正确答案:

​A river usually begins far up in the mountains or hills.

试题解析

or是并列连词,所以前后两部分是一致的,又因为mountains是复数,所以应该把hill变为复数hills。