题目内容
15．-Tom，you kept me waiting for twenty minutes．-I was just about to leave _______ the telephone rang．And it was from my sister in the UK．（ ）
| A． | when | B． | while | C． | because | D． | since |
分析 --汤姆，你让我等了你二十分钟．
--我正要走的时候，这时突然电话响了，是我妹妹从英国打过来的．
解答 答案：A．when意思是"这时突然"经常与be about to构成短语"be about to…when…"意思是"正要做某事时，这时突然…"；while意思是"当…的时候"强调指主句和从句的动作同时进行；because意思是"因为"；since意思是"自从…以来"．根据"I was just about to leave _______ the telephone rang"我正要走的时候，这时突然电话响了，所以要用when，故选A．
点评 首先要掌握这几个连词的意思以及用法，然后结合具体的题目，就可以确定正确答案．
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