关于反义疑问句的回答

给个例句吧：-They ___ clean the City Park today ,do they?

- ___ . It's too dirty.

A.needn't;Yes,they do. B.don't need to;No,they don't. C.needn't;No,they don't. D.don't need to;Yes,they do.

选D。由疑问子句do they?可知，第一空用实意动词need的否定式，因此排除A、C。由It's too dirty.可知，公园要打扫，所以选D，意思是“不，要打扫”。选项B的意思是“是的，不必打扫”。