However, they mentioned that it could be resubmitted after making the required changes. Could not convert string to float 使用float ()函数来转换字符串为浮点数是，python抛出valueerror，并提示，could not convert string to float，意思是无法将参数指定的字符串转换为浮点. Should have done，表示过去本应该做的事情，但却没做。其否定形式表示过去本来不应该做某事，但是实际上却做了。 could have done，表示：①对过去某种情况的怀疑或者是不确定（情态动词 推测.
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Could + have +过去分词 （been:
Both reviewers suggested major revisions, and the editor rejected the manuscript.
The experts considered the likelihood that risks could become serious problems in the future.they. Be的过去分词） = could have been翻译字眼跟上面的一模一样 i could have been there on time if i had left home earlier.（能力） 我本可以准时到达那里. I wish i could have gone with you to the concert last night.
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