Hewasabouttotellmethesecretsomeonepattedhimontheshoulder.A.asB.untilC.whileD.when

Question

He was about to tell me the secret________ someone patted him on the shoulder.
A.as
B.until
C.while
D.when

Answer 1

答案D
“be about to do sth .when…”连用,表达了“正要做某事就在这时……”的意思,when在句子中是并列连词,意为“and just at that time.”