题目内容
—Mom, can I go out and play with my friends now?
—No, honey, you can’t _____ you haven’t recovered from the knee injury.
| A．until | B．before | C．as | D．unless |
C
解析试题分析：句意：--妈妈我现在能和朋友出去玩吗？--不，亲爱的你不能，因为你的膝盖的伤还没有恢复。As这里表示“因为，既然”，A. until直到，B. before 在…前面，D. unless除非，所以选C。
考点：考查连词
He was about to leave the office for home _______someone knocked the door and asked for some help.
| A．until | B．while | C．as | D．when |
______ the ancient Egyptians built the pyramids puzzled people for centuries.
| A．Whether | B．What | C．How | D．Where |
It is uncertain side effect the medicine will bring about , though about one thousand patients have taken it.
| A．that | B．whether | C．what | D．how |
_______ I’m not sure of winning the match, I will have a try anyway.
| A．While | B．Before | C．Once | D．Since |
—I rang you at about nine，but there was no reply．
—Oh，that was probably I was seeing the doctor．
| A．why | B．when | C．what | D．that |
I always take something to read when I go to the doctor’s ___________ I have to wait.
| A．in case | B．so that | C．in order | D．as if |
_____ there was no conclusive evidence, most people thought he was guilty.
| A．Since | B．While | C．When | D．However |
________ all of them are strong candidates，only one will be chosen for the post.
(2011·陕西，19)
| A．Since | B．While |
| C．If | D．As |