— Yes. He had never praised him

　　he became one of the top students in his grade.

　　（03北京春季）

　　A．after B．unless C．until D．When 2) Simon thought his computer was broken ________ his little brother pointed out that he had forgotten to turn it on.

　　（05北京春季）

　　A. until

　　B. unless

　　C. after

　　D. because

　　C A until / till “直到……止”(肯定句，主句是延续性动词);

　　not…until “直到……才”(否定句，主句是终止性动词);

　　until 可用于倒装句和强调句，till不用于句首。

　　Not until I returned did she finish her homework.

　　It was not until I returned home that she finished her homework. 4 before, after,since We had sailed four days and four nights before we saw land. Please write it down before you forget it. Before I could get in a word,he hung up. It is five years since he left here. It is five years since he enjoyed a good meal. 问题3： 1、The American Civil War lasted four years ______ the

　　North won in the end. (05广东卷)

　　A. after

　　B. before

　　C. when

　　D. then 2、He made a mistake, but then he corrected the situation

　　_____ it got worse.

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