---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

目前对（）油气层的综合解释符合率最高。

A、砂砾岩类

B、泥岩类

C、砂岩类