—The play is seldom put on here,is it?—.Only once three weeks ago.A. No,it isn’tB. Yes,i

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(答案→)A. No,it isn’t
B. Yes,it is
C. Yes,it was
D. No,it is 
解析：答语中的only once three weeks ago暗示了“这部话剧并不常在这儿上演”，这是对问句的肯定，故应用No,it isn’t（是的，不经常）.C、D两项本身结构有误。