The school rules state that no child shall be allowed out of the school during t
题型：同步题难度：来源：
The school rules state that no child shall be allowed out of the school during the day, _____ accompanied
by an adult. |
A. once
B. when
C. if
D. unless |
答案
举一反三
| The girl had hardly rung the bell _____ the door was opened suddenly, and her friend rushed out to greet her. |
A. before
B. until
C. as
D. since |
| Tim is in good shape physically _____ he doesn"t get much exercise. |
A. if
B. even though
C. unless
D. as long as |
| You will be successful _____ you have confidence. |
A. before
B. once
C. until
D. though |
| _____ they decide which college to go to, students should research the admission procedures. |
A. As
B. While
C. Until
D. Once |
| ______ all of them are strong candidates, only one will be chosen for the post. |
A. Since
B. While
C. If
D. As |
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