Qian Xuesen tried many times _________ he found the solution to the puzzle about
题型：不详难度：来源：
Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.| A．after | B．before | C．since | D．when |
|
答案
| B |
解析
试题分析：after在……之后；before在……之前；since自……以来；when当……时候。
句意：钱学森在他发现航天技术之前，他尝试了许多次。
点评：本试题难度适中。判断从句中用哪个连词，需用记住连词的用法，在句中的作用，连词也是高考的热点，需要考生平时多练习。需要考生会分析句子成分理解句意。
即学即练：They stood respectfully ______he entered the room.
A. after B. before C. since D. when
解析：D。句意：当他走进房间时，他们都恭恭敬敬地站着。 |
举一反三
Physical Education in schools can teach us endurance — something we all need ______ life becomes tough.| A．unless | B．in case | C．though | D．until |
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He thought she was a pretty girl poorly she was dressed.| A．how | B．as though | C．as long as | D．however |
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| ______ time went by , Herbert could finish all the maths exercises in class. |
We were about to go out for a walk ______ it began to rain.| A．while | B．before | C．as | D．when |
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| _______ excited his parents most is that he had passed the entrance exam and was admitted into his dream college. |
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