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问一些高中的英语问题,请速速回答.

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问一些高中的英语问题,请速速回答.
1.His greatest work was done_____he had the opportunity of meeting any of the great men of physics of his day.
A.after B.before C.when D.as
2.A look of a disappointed came into my mother's eyes___she read the letter.A.since B.because C.although D.as
3._____having had ten months' strict practice,I decided to make one more effort.A.WhenB.before C.After D.Until
4._____the disscussion was still going on,the president came in and joined us.A.Because B.Since C.While D.Before
5._____he had a passion for walking,we started off on foot instead of by car.
A.When B.While C.As D.After
问一些高中的英语问题,请速速回答.
B,D,C,C,C

通过句子意思可知前后两个句子的关系,在他有机会接触到任何当时物理界伟大人物之前,他的著作就已经完成了.any有否定的意思,所以是他没机会见到任何物理界伟人,before是唯一选择,其他的答案填进去都无法说通

since是完成时的标准,显然句子里没有完成时出现,排除.because,句子里面不存在强烈的因果关系,填进去略显别扭.although在句子里也说不通,从句意来说

通过句意显然排除before.when是当……时,Until的话,后面的动词形式不对

while表示两个动作同时发生,符合句子情况

As这里表示原因,因为他有意愿走路所以我们没有选择坐车而是走路