There are six boys and two girls in the classroom; that’s eight .A. at all B. in allC. aft

问题补充：

There are six boys and two girls in the classroom; that’s eight .

A. at all

B. in all

C. after all

D. above all

答案：

A. at all

(答案→)B. in all

C. after all

D. above all

解析：考查介词短语辨析。At all根本，全然（与否定词连用）；in all共计；after all终究；毕竟；D首先，最重要的；句意：在教室里有6个女孩和2个男孩，共计有8个学生。根据句意说明B正确。