2019年高考英語知識點必修二Module 5單元總復習教案
我正沿著河邊走，突然聽到了一個溺水兒童的呼救聲。
②i was about to leave when it began to snow.
我正準備離開這時天突然下起雪來。
③he was going to run away when the police came.
他正準備逃跑，這時忽然警察來了。
12.(高考全國卷ⅱ) tom was about to close the window __________his attention was caught by a bird.
a.when b.if
c.and d.till
解析：選a。句意：湯姆正要關上窗戶，就在這時一只鳥引起了他的注意。在句式“...be about to do when...”中，when 作并列連詞，相當于and at that time，句中was about to do為標志詞，故答案為a項。
【即境活用】
13.(高考福建卷)she had just finished her homework __________her mother asked her to practise playing the piano yesterday.
a.when b.while
c.after d.since
解析：選a�？疾檫B詞。句意：昨天她剛一做完家庭作業，她媽媽就讓她去練鋼琴。when 在這里的意思是“一……就；剛……就”。