Jack ____his keys everywhere ,but he couldn't find them.答案是looked for 为什么是加ed而不是加s
人气：129 ℃ 时间：2019-12-14 01:51:22
解答
因为后半句句子出现了couldn't,说明这句话的时态是一般过去式
所以：使用动词的过去式
即：looked for 加ed就可以不考虑动词的单复数吗动词过去式不区分单复数。那动词ing要不要当然要is doingare doing有区分！！
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