【题目】_______ many Chinese holidays are directed towards services remembering ancestors, the Ching Ming Festival is beyond doubt the largest.
A. UnlessB. Since
C. OnceD. While
在线课程【答案】D
【解析】
考查连词词义辨析。A. Unless除非；B. Since既然；C. Once一旦；D. While虽然。句意：虽然许多中国节日都是为了纪念祖先，毫无疑问，清明节是最隆重的。根据句意可知此处表示“虽然”，故D项正确。