正要做……这时……

　　①He had just gone to bed when the telephone rang.

　　他刚上床睡觉，这时电话响了。

　　②He was reading newspapers when he heard his name called.

　　他正在读报，这时听到有人叫他的名字。

　　③I was about to go out when an unexpected visitor came.

　　我正要出门，一位不速之客来访了。

　　④She was on the point of leaving when I arrived.

　　她正要离开，这时我来了。

　　when用作连词，意为“既然”。

　　⑤How can they expect to learn anything when they never listen?

　　既然他们从不听讲，他们怎么能指望学到东西呢？

　　11.(2010·全国卷Ⅱ)Tom was about to close the windowhis attention was caught by a bird.

　　A．whenB．if

　　C．andD．till

　　解析：　句意为：汤姆正要关上窗户，就在这时一只鸟引起了他的注意。在句式“...be about to do when...”中，when作并列连词，相当于and at that time，句中was about to do为标志词，故答案为A项。

　　答案：　A

　　12．(2009·福建卷)She had just finished her homework________her mother asked her to practise playing the piano yesterday.

　　A．whenB．while

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