Question

高中状语从句小题（附答案，求解释）

_____ important we may regard school life to be,parents have a great influence on their children because they spend more time at home than in the classroom.
我选的Although，答案是However，我觉得意思上不对啊

____I failed in English a third time, I had no doubt about my gift for foreign language.
答案是Until，我选Unless为什么不对呢？

John knocked at the door for nearly five minutes ____ his wife opened it.
答案是before，until为什么不可以？

Answer 1

However后边可以直接接形容词。在这里接的是 important ，假如用Although，应该是 Although we may regard school life to be important。
第二个句子中 not 和until是固定搭配。直到。。。才。在本句中的not ,也就是后边 no doubt 中的no了
第三个要用before,until一般和not 搭配，而这句中没有。这句的意思是他敲门敲了将近五分钟后，她的妻子才开门。虽然before的意思是在。。。之前。但翻译就不同了。