He was zbout to tell me the secret someone patted him on the shoulder.

问题描述:

He was zbout to tell me the secret someone patted him on the shoulder.
A as B until C while Dwhen

D
他正要告诉我这个秘密,这时候有人拍他肩膀.
A因为,当.时候 B 直到 C当.时候 D当.时候;正在这时(=at that time) (这句话就取得这个意思)