— You were really brave to save the drowning boy from the river.

— Anybody else ______ that under the same circumstances. [ ]

A. would have done

B. would do

C. must have done

D. had done

肋骨先天性畸形常见的类型有（）

A.颈肋

B.肋骨联合畸形

C.肋骨分叉畸形

D.以上都是

E.以上都不是