Scientists say it may be five or six years ________ it is possible to test this
题型：天津同步题难度：来源：
| Scientists say it may be five or six years ________ it is possible to test this medicine on human patients. |
| [ ] |
A. since
B. after
C. before
D. when |
答案
| C |
举一反三
| We hired a boat __ we could go fishing on the weekend. |
| [ ] |
A. in order to
B. so as to
C. in order
D. so that |
| Jack wasn " t saying anything but the teacher smiled at him _____ he had done something very clever. |
| [ ] |
A. as if
B. in case
C. while
D. though |
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 |
| _________I meet him, I always think of the things which happened between us. |
| [ ] |
A. Every time
B. For the time
C. The night
D. At no time |
The wise parents can tell whether their children are telling the truth __________ they listen
to their excuses to wrong deeds. |
| [ ] |
A. the first time
B．for the first time
C．every time
D. for every time |
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