Could + have +过去分词 （been: Both reviewers suggested major revisions, and the editor rejected the manuscript. However, they mentioned that it could be resubmitted after making the required changes.
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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.
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. 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. I wish i could have gone with you to the concert last night.
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