Qian Xuesen tried many times _________ he found the solution to the puzzle about

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.afterB.beforeC.sinceD.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.unlessB.in caseC.thoughD.until

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He thought she was a pretty girl     poorly she was dressed.
A.howB.as thoughC.as long asD.however

题型:不详难度:| 查看答案
______ time went by , Herbert could finish all the maths  exercises in class.
A.WithB.AsC.whileD.Since

题型:不详难度:| 查看答案
We were about to go out for a walk ______ it began to rain.
A.whileB.beforeC.asD.when

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_______ excited his parents most is that he had passed the entrance exam and was admitted into his dream college.
A.ThatB.WhatC.WhichD.It

题型:不详难度:| 查看答案
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