下列各项中，属于记账凭证必须具备的基本内容是（）
A、出具凭证单位财务章
B、实物数量、单价和金额
C、会计科目
D、接受凭证单位名称
参考答案：C
受教育是公民的权利，是个人私事，所以可以放弃。
The student asked her professor if he would have gone on the space ship he did know earlier.
A．if he knew
B．if he knows
C．he had known
D．had he known
