英语翻译

问题描述:

英语翻译
In this way he was able to solve the mystery._________ he did it.
a.That's so b.Like this c.That's how d.So
这里答案选c,请问:that's how he did it.这句话怎么翻译?

他就是那么做的.
相信我,学了十几年英语了,不会错的.