短文改错 (共10小题；每小题1分，满分10分)

Today I was having a PE lesson while I fell down and hurt my foot．I was in great pain at that moment but I tried to act as if nothing happened until the class was over． Although I had difficulty walk back to my classroom, but I still didn't tell anyone and even refused the offer of help from my classmates． As the result, the hurt on my foot became worse．Now I know I am wrong．We can tell other our need for help and accept their help．Someday we can help him in return．In this way, we can get along with each other happy and peacefully．

集成测试中使用的主要的测试方法为________。

A．黑盒测试

B．灰盒测试

C．回归测试

D．白盒测试