文中共有10处语言错误，每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线（\）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1.每处错误及其修改均限一词。2.只允许修改10处，多者（从第11处起）不计分。
This morning I went to ask for my English teacher to give me some advice on why to learn English well on the weekend. When I arrived his office at 8 o’clock, he had already done her work for almost one hour. First, we should make a plan of study and carry them out until we succeed. Then, we must master any basic knowledge of English such as 26 letters and 48 sounds. Vocabulary is bricks and grammar is bones. We can make different kinds of phrases and sentences with them according the rules. Finally, practice make perfect. When I leave, it was 12 o’clock. Through this lesson, I learned something which couldn’t be learned from textbooks. 

文中共有10处语言错误，每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线（\）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1.每处错误及其修改均限一词。2.只允许修改10处，多者（从第11处起）不计分。

This morning I went to ask for my English teacher to give me some advice on why to learn English well on the weekend. When I arrived his office at 8 o’clock, he had already done her work for almost one hour. First, we should make a plan of study and carry them out until we succeed. Then, we must master any basic knowledge of English such as 26 letters and 48 sounds. Vocabulary is bricks and grammar is bones. We can make different kinds of phrases and sentences with them according the rules. Finally, practice make perfect. When I leave, it was 12 o’clock. Through this lesson, I learned something which couldn’t be learned from textbooks. 

It was 12 o’clock at midnight ________ she returned home hurriedly．

1. A.
   since
2. B.
   until
3. C.
   when
4. D.
   that