解析.
本题答案为doesn‘t she.
Sally's sister usually goes to work by bus.该句中的谓语是goes,轮提问也该用does.
而反义疑问句中,若主句是肯定,疑问句则为否定.反之,主句是否定,疑问句则为肯定.
Sally's sister usually goes to work by bus.为肯定句.所以用doesn‘t she.
拓展.
isn' she的用法可以参照以上举一反三.
例:主句为She is a doctor,则反义疑问句为isn' she?
同样,都是如此.
=-=.很高兴解答.