She could write letters in English at the age of eight,(保持原句意思）She______ ____ ____write letters in English at the age of eight

She could write letters in English at the age of eight,(保持原句意思）She______ ____ ____write letters in English at the age of eight
She could write letters in English at the age of eight,(保持原句意思）
She______ ____ ____write letters in English at the age of eight

She could write letters in English at the age of eight,(保持原句意思）She______ ____ ____write letters in English at the age of eight
wasn't able to

is able to

She is able to write letters in English at the age of eight.

was able to

She was able to write letters in English at the age of eight.

was able to
at the age of eight喔，肯定用过去式啦