He was ill in hospital. His teacher looked after him                        .           [ ]

A. as good as possible            

B. as soon as possible            

C. as well as possible            

D. as better as possible

集成测试中使用的主要测试方法为______。

A．黑盒测试

B．灰盒测试

C．回归测试

D．白盒测试