I was walking along the road someone patted me on the shoulder from behind.A. whileB. im

问题补充：

I was walking along the road someone patted me on the shoulder from behind.

A. while

B. immediately

C. when

D. the moment

答案：

A. while

B. immediately

C. when

D. the moment

解析：考查连词。A当。。时候B一。。就C 当。。时候 D 一。。就。句意 当我在散步时这时有个人从后面拍了我的肩膀。考查固定结构 be doing when。。。正在做某事这时。。。，故选C项。

考点 :考查连词。