▲本题答案只能选 A，但这里的 pay 并不表示打折，pay down 的意思是“付定金”，pay down for 的意思是“为……付定金”。

The furniture was just what he needed, so he paid 30 percent down for it.

句意为：那家具正是他需要的，所以他付了30%的定金。

▲更多例句：

Pay me 50 down and the rest at the end of the month. 先付给我50英镑定金，余款要月底付清。

He had a simple, conventional deal and paid 20 percent down at settlement. 他做了一笔简单而常规的交易，在结算时预付了20%的定金。

▲也可以用 pay a deposit 来表示付定金。如：

The purchaser of the house will pay the deposit next week. 买房者下周付定金。

They’ll quite likely ask you to pay a small deposit. 他们很有可能让你付少量定金。

The shop promised to keep the goods for me if I paid a deposit. 商店答应，倘若我付定金就给我保留这批货。