【英语问题】Mr Brown was very tired yesterday,because he kept______(walk)for two hours.

【英语问题】Mr Brown was very tired yesterday,because he kept______(walk)for two hours.
横线处为什么填“walking",而不是"to walk"
英语人气:223 ℃时间:2020-02-04 05:35:34
优质解答
keep doing sth 一直做某事
连续走了两个小时,中间没有停
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