When and where to have a picnic yet
A are not decided
B has not decided
C have not been decided
D is not decided
yet不是完成时的标志么 那为什么不用完成时呢
d
人气：115 ℃ 时间：2020-04-09 02:11:50
解答
知道了
when and where to have a picnic 这里是指一件事,所以是单数,而yet只是起一个强调“没有”的作用
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