Question

According to the rules of the school，you must ask for leave in advance you have

1.According to the rules of the school，you must ask for leave in advance you have a
doctor’s diagnose note．
A．even though B．as if C．now that D．unless
答案 D
2.
Mc Grady says he doesn’t care about Yao Ming getting 30 or 40 points and he just gets 15, ______ Houston Rocket wins.
A. unless B. though C. as long as D. as far as
答案 C
3.
I left the house I remembered the key. Luckily, I was still in the doorway and the
door was not shut behind me.
A. Before B. While C. As D. After
答案 C
4.
She was so angry that she rushed out into the rain I could stop her.
A．until B．before C．after D．as
答案 B
请高手帮忙分析说明一下选这些答案的原因和理由，谢谢！

Answer 1

只要你理解了各段单词，每个词组和各个句子的含义，答案是显而易见的。
1 根据学校规定， 离校必须请假， 除非（unless)......
2 他不在乎姚明得多少分，只要（as long as)........
3 这道选择相对困难， 但只要as 对应与同步和原因
4 before 后跟任何动作行为， 都表示来不及做的， 这些都是要不断记忆。