She couldn't make mistake on this matter becarse she had tried it many times.could 这儿怎么理解?能用can't

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Shecouldn''tmakemistakeonthismatterbecarseshehadtrieditmanytimes.could这儿怎么理解?能用can''tShecouldn''tmakemi

She couldn't make mistake on this matter becarse she had tried it many times.could 这儿怎么理解?能用can't
She couldn't make mistake on this matter becarse she had tried it many times.could 这儿怎么理解?
能用can't

She couldn't make mistake on this matter becarse she had tried it many times.could 这儿怎么理解?能用can't
could较为委婉,仍有说错的余地