I wonder how you finished the work.

A．I want know how you finished the work.

B．I want to know how you finished the work.

C．I know how you finished the work.

D．I want to know you how finished the work.

GIS安装中，测量回路电阻应在（）。

A.任意时间

B.充SF6气体前

C.与抽真空同时进行

D.抽真空之前