---Could you please tell us _____ the famous singer will come for his performance?

---Probably in weeks, and the tickets won’t be expensive.

A．how often

B．how long

C．how soon

D．how much

对冠状静脉窦扩大者，于左肘静脉注射造影剂见冠状静脉窦显影后右房显影，于右肘部位注射则冠状静脉窦内无造影剂，此病可能是

A．永存左上腔静脉
B．心内型肺静脉异位引流
C．心上型肺静脉异位引流
D．心下型肺静脉引流
E．三房心