患者女7岁，右上颌中切牙外伤冠折、切角缺损，即刻来院就诊。口腔检查发现：穿髓孔大，探痛明显，可疑叩痛。治疗首选（）

A.直接盖髓术

B.活髓切断术

C.拔髓术

D.根管治疗术

E.塑化疗法

Jane was badly taken in when she paid $300 for that second-hand bicycle; it was not worth

A．that all much

B．all that much

C．much all that

D．that much all