单项选择题

Payment to be made by cash on delivery.
The invoice has to be paid（）

A．after the shipment arrives.
B．before the shipment arrives.
C．when the shipment arrives.

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单项选择题

A．You don't have to knock before you go in.
B．Please don't come in now.
C．You can go in without opening the door.

Payment to be made by cash on delivery.The invoice has to be paid（）