Mary couldn’t remember when she first met Mr. Anderson, but she was sure it was _____ Sunday because everybody was at _______ church.A./;theB.the;/C.a;/D./;a
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C解析句意：玛丽不记得第一次遇见 Mr. Anderson是什么时候，但她肯定是在一个星期日，因为大家都在做礼拜。泛指一个星期日，用a修饰；at church做礼拜;at the church在教堂里。所以选C。