Is it only when you fail you will be aware of your mistakes?A. thatB. andC. orD. unless

问题补充：

Is it only when you fail you will be aware of your mistakes?

A. that

B. and

C. or

D. unless

答案：

(答案→)A. that

B. and

C. or

D. unless

解析：强调句型的一般疑问句的结构为：Is/Was it+被强调部分+that/who+其他？被强调部分为only when you fail,故选A。句意，是不是只有当你失败的时候你才会意识到你的错误呢？