He was about to tell me the secretsomeone patted him on the shoulder.A. asB. untilC. whil

问题补充：

He was about to tell me the secretsomeone 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：选D。考查连词。句意: 他正要告诉我这个秘密, 这时突然有人拍了一下他的肩膀。be about to do. . . when. . . 是固定句型, “正要做……这时……”。