I know that from A to Z.(选项：A.从A到Z B.从头到尾 C.字母表 D.

I know that from A to Z.(选项：A.从A到Z B.从头到尾 C.字母表 D.
I know that from A to Z.(选项：A.从A到Z B.从头到尾 C.字母表 D.

I know that from A to Z.(选项：A.从A到Z B.从头到尾 C.字母表 D.
我知道得很清楚.（A-Z指的是所有内容）
应解释为：我对此了如指掌. 我对此很清楚.

选择B

选 B
from A to Z 彻底，从头到尾