肾结核的钙化灶形态是（）

A.多发囊状钙化

B.片状钙化

C.弧线形钙化

D.斑点状钙化

E.斑片云朵状钙化

—It's one o'clock now. I must go.

—It's raining outside. Don't leave             it stops. [ ]

A. when

B. since

C. while

D. until