定量测定项目室内质量控制活动主要控制的是（）

A.准确度

B.精密度

C.特异性

D.灵敏度

E.系统误差

——-We had a good time in dancing at a disco, why didn't you go with us?

——-I ________ there, but my parents didn't let me go.

A．couldn't go

B．failed to go

C．hadn't gone

D．would have gone