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. In that country，August 31st is a national festival ________ everyone，men and women，old and young，sings and dances happily in the streets.

A．where         B.when             C．that                D．as

In that country，August 31st is a national festival ________ everyone，men and women，old and young，sings and dances happily in the streets.

A．where            B．when             C．that             D．as

In that country，August 31st is a national festival ________ everyone，men and women，old and young，sings and dances happily in the streets.

　 A．where　　　　 B．when　　　　　 　 C．that　　　　　 　 D．as