I think it was the 17th yesterday.

I think it was the 17th yesterday.

题目
I think it was the 17th yesterday.
I don't think it was.
It can't have been 17th yesterday.
It must have been 16th yesterday.帮我看看有无语法错误
答案
I don't think it was 应为I don't think so
其他没有错误
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