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Mrs black often goes to work by bike ,but she ( )[not]today.

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Mrs black often goes to work by bike ,but she ( )[not]today.适当形式填空,写上原因最好.
Mrs black often goes to work by bike ,but she ( )[not]today.
didn't
今天没有骑车去 说明已经发生了
所以用过去时
再问: 为什么用过去时呢?
再答: 布莱克太太今天没有骑车去 说明这件事情已经发生过了啊