Question

in this way he was able to solve the mystery .( )he did it. 1 that's so 2 like this

3 that's how 4 so 选择哪一个，及分别说出为什么对与错
解释其它选项都是什么意思

Answer 1

选 3 that's how he did it. 意思是：那就是他如何做到的。
1. that's so 的话，so在这里是代词，所以后面的it 多余了
2. like this 的话，要把它放在最后：he did it like this
4. so 要用的话，是要倒装的，so did he，意思是：他也是这么做的，意思也不对

Answer 2

选3 that's how he did it. 那就是他怎么做的， 是对上一句的总结，他已经做了
so引导结果，因此。。。

Answer 3

4