________ Mary ________ Sue knows nothing about the matter, ________ they didn’t e to school yesterday．A.Either; or; becauseB.Both; and; asC.Neither; nor; sinceD.Not only; but; for
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D解析both…and…连接并列主语时，谓语应用复数，由第二个空后的knows可知B项错误；从后面的原因知道昨天她们没来上学，其结果当然是对那事一无所知，因此