Question

【题目】Friendship has to be ________trust, as we all know.

A. found on B. believed in

C. founded on D. believed

Answer 1

【答案】C

【解析】考查被动语态及非限制性定语从句。正如我们都知道的，友谊必须建立在信任的基础上。found on (或 upon)以…为根据，以…为基础。友谊是被建立的，所以要用found的过去分词founded 。