几道单选题.
要求:句子翻译,每个选向错误的原因和正确的原因
3:SwanLakeisafamousballetinforacts____onaGermanfairytale.
AbassingBbasedCbasesDtobase
15:Hediscoveredinthegroundapot____32,000Chinesemetalcoins.
AcontainingBcontainedCtocontainDcontain