If you become a policeman I will be a____ to help many people

问题描述:

If you become a policeman I will be a____ to help many people
同上
根据首字母提示补全单词

你这里的a是首字母吗?
那句子应该是
If I become a policeman I will be able to help many people
而不应该是If you become...