单选题 It is known to every one that the film is ______ a real event.
A. based on B. built on C. looked on D. carried on

【正确答案】 A

【答案解析】[解析] 词义辨析。
[解析] be based on以……为基础；be built on建在……之上；be looked on(as)被看做……；be carried on被继续执行。故选A。