【題目】We'll supply you with the products only __________ you prove your ability of payment.

A. that B. on condition

C. on that D. on condition that

【答案】D

【解析】句意：我們?yōu)槟峁┊a(chǎn)品的前提條件是你證明自己的支付能力。on condition that意為“條件是”。

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