My father didn't give up smoking until the doctor asked him to do so.(保持原句意思)My father ______ smoking ________ the doctor asked him to do so.

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My father didn't give up smoking until the doctor asked him to do so.(保持原句意思)My father ______ smoking ________ the doctor asked him to do so.
My father didn't give up smoking until the doctor asked him to do so.(保持原句意思)
My father ______ smoking ________ the doctor asked him to do so.

My father didn't give up smoking until the doctor asked him to do so.(保持原句意思)My father ______ smoking ________ the doctor asked him to do so.
still unless

has quitted
since
since前加完成时态,后加过去时态

quitted/since
my father quitted smoking since the doctor ask him to do so.

我认为狠可能kept although。应该是较简单的连词!