He was about to tell me the secret someone patted him on the shoulder.A. asB. until C. wh

问题补充：

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

A. as

B. until

C. while

D. when

答案：

A. as

B. until

C. while

D. when

解析：此题考查be about to do something when…这个句型的用法，when的意思是：这时（at the time）. 这句话的意思是：他正要告诉我这个秘密，这时有人拍他的肩膀。