—________ are you going to write this story?

—About five pages. [ ]

A. How often

B. How soon

C. How long

D. How fast

图示超静定刚架，用力法计算时，可选取的基本体系是：（）

A.图A.、B.和C.

B.图A.、B.和D.

C.图B.、C.和D.

D.图A.、C.和D.