when句型
(1) be doing sth...when...
例：He was still smiling when the door opened and his wife came in.
他正笑著的時(shí)候門突然開了，他妻子走了進(jìn)來。
(2) be about to do sth ... when ...
例：We were about to start when it began to rain.
我們剛要出發(fā)，天就開始下雨了。
(3) had just done ... when ...
例：I had just gone to bed after a very hard day when the phone rang.
在勞累了一天之后我剛剛就寢，電話鈴就響了。
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