He was wearing a vest __his shirt如题（介词填空）.另外请问while跟when 什么区别
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He was wearing a vest __his shirt如题（介词填空）.另外请问while跟when 什么区别
He was wearing a vest __his shirt
如题（介词填空）.另外请问while跟when 什么区别
He was wearing a vest __his shirt如题（介词填空）.另外请问while跟when 什么区别
你好,新鲜百分百
针对你的两个疑问,分点回答,稍为繁复,希望多一点参考,帮助你消疑解惑.
1.He was wearing a vest under his shirt.
填空介词“under”或者“underneath”.
特参考于某外文网站,保证正品.
例：Do you wear a short sleeved vest underneath your shirt?
2.while跟when 区别
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.
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.
③从句的谓语动词如表示状态时,通常用while.如：
We must strike while the iron is hot.我们应该趁热打铁.
④when从句与主句动作先后发生时,不能与while互换.
When he has finished his work, he takes a short rest.每当他做完工作后,总要稍稍休息一下.(when = after)
outside
while 在……期间
when 在那时