he was about to tell me the secret_____someone patted him on shoulder

问题描述:

he was about to tell me the secret_____someone patted him on shoulder
A,as
B,until
C,while
D,when
为什么选D
不选C?

因为这是时间点,不是时间段!when,while这三个词都有"当……时候"之意,但用法有所不同,使用时要特别注意.①when意为"在……时刻或时期",它可兼指"时间点"与"时间段",所引导的从句的动词既可以是终止性动词,也可是持续...