should this letter have crossed in the post with your reply这个句子中should错在哪里?

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should this letter have crossed in the post with your reply这个句子中should错在哪里?

should this letter have crossed in the post with your reply这个句子中should错在哪里?
should this letter have crossed in the post with your reply
这个句子中should错在哪里?

should this letter have crossed in the post with your reply这个句子中should错在哪里?
should this letter have crossed in the post with your reply
should--->may