![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
I did not have many of the materials that the books discussed, but I learned through trial and error.
A.
I did not have many of the materials that the books discussed, but I tried a number of different ways and learned from the mistakes that I made.
B.
I did not have many of the materials that the books discussed, I made trials and mistakes
C.
I did not have many of the materials that the books discussed, but I learned through tests.