Ted couldn't remember the exact date of the storm, but he knew it was ______ Sunday because everybody was at______ church.
【正确答案】 B
【答案解析】本句前半句提到Ted不记得确切的日期了，因此Sunday是指“一个星期天”，而非特指，所以用不定冠词a。church在这里不是特指某个教堂，而是at church=in church“做礼拜”，故不用冠词。