Question

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

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???????

Answer 1

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，也可是持续性动词。如：
When
I
got
home,
he
was
having
supper.我到家时，他正在吃饭。
When
I
was
young,
I
liked
dancing.我年轻时喜欢跳舞。
②while只指"时间段"，不指"时间点"，从句的动词只限于持续性动词。如：
While
I
slept,
a
thief
broke
in.在我睡觉时,盗贼闯了进来。
这里用when。while指时间段