I can’t remember the exact date when Smiths came to see him, but it was Sunday.A a, the B

发布时间：2020-08-20 20:14:44

I can’t remember the exact date when      Smiths came to see him, but it was     Sunday.
A a, the  B the, a  C a, a  D the, the

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解析：考察冠词用法。前文特指史密斯一家，故用定冠词，下文泛指任何一个星期日，故用不定冠词，选B。
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