单项选择题
缴纳的税款，以（）为合法有效凭证。
A.财政票据B.完税凭证C.签收单据D.发票
单项选择题 The second major known language known in England was ( ) The second major known language known in England was of the Roman Legions of the Roman Legions.
单项选择题 Which is not the benefit for students in joining in student clubs？（）
单项选择题 Which conversation is more formal?()
