采购业务的常见业务模式都有（）
A、普通采购业务
B、代管采购业务
C、固定资产采购业务
D、直运采购业务
参考答案：A, B, C, D
When you communicate with people, it is not unusual to find yourself in a situation ____ you have to politely decline an offer.
A．where
B．which
C．what
D．why
缠绕茎
