单选题Mary hasn't decided wheth

问题补充：

单选题Maryhasn decidedwhethertotakeuptennis,basketball,or___.A.beginning to play footballB.begin to play footballC.beginning playing footballD.to beginning playing football

答案：

B解析连词词组whether..or连两个不定式 to take up和begin两者并列。须保持形式一致，D项表达方式错误。