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英语语法It is no longer a question _________ we can fly to the m

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英语语法It is no longer a question _________ we can fly to the moon.A that B whether 选哪个?
这是一道有争议的题目.是答案有争议.
一般都认为答案是C.that,但我认为最佳答案为B.whether.
此题是由It is no longer a question now _______ man can land on the moon.变来的.
不管用that还是whether,它们都是连词引导主语从句,由于主语太长,用形式主语it来代替,将“真主”后置.我们知道,that-引导的从句是一个事实,whether-引导的是一个问题.也就是说,that是由一个陈述句变来的,而whether是由一个一般疑问句变来的.
如whether 从句作主语,则表语通常为:(It is ) not known yet,(it is) a question...
如:it is not known whether he will come.It is a question whether he will come.
而that-从句作主语,则表语则应是(it is) a fact .如It is a fact that he will come.
这道题目中出题者(如果认为答案是that的话),没有注意no longer和not的区别.
如果是not,答案应该是that:推理如下:
我们不用形式主语,说:Man can land on the moon is a fact ,not a question.
人类能登上月球,这是一个事实,不是一个问题.
-->Man can land on the moon is not a question now.
人类能登上月球,这不是一个问题.
其实汉语嫌这个主语太长,用了这个“指称”词“这”
所以英语这么说比较好:It is not a question now that man can land on the moon.
但是no longer表示“不再是.”,说明“以前曾经是一个问题”,或对有的人(对科学不是很了解的人)而言,是个问题:“Can man land on the moon?Can man land on the Mars?”
Whether man could land on the moon was a question 40 years ago.
40 years ago,it was a question whether man could land on the man.
人类能否登上月球,这在40年前是一个问题.
但这个问题现在不再是个问题了.
But the question is no longer a qustion now.
But the question is not a question any longer.
But the question whther man can land on the moon is no longer a question now.
Wheter man can land on the moon is no longer a quuestion now.
It is no longer a question now whether man can land on the moon.
反过来说,that-从句本来就不是一个问题,哪来的“不再是一个问题呢”,这么说,就说明它曾结是个问题嘛!
所以原题干最好不要用no longer,改用not
原题分析同上.追问It depends on the weather whether we go out tomorrow.
此处表示未知,故用whether;
原题“能把旗子插在外太空已经是已知”,表示已知,故用that.
但是,我不知道“我能否成功已经不再是个问题.”和“我能成功已经不再是个问题.”的区别.回答名词性从句whether-从句是由一个一般疑问句变过来的.也就是说它是一个问题,一个yes/no question变过来的,也就是一个是否的问题.既然说它不再是个问题,说明它是以前是一个问题.
Whether man could land on the moon was a question but it is no longer a question now.
人类能否登上月球(这个问题)以前是个问题,但现在不再是个问题了.
你可以说:我能否成功,这(个问题)在以前是个问题,但现在不再是个问题了.
你可以说:我能成功,这是一个事实.也可以说:我能成功,这不是个问题.
但不宜说:我能成功,这不再是个问题.(因为前面一句话是个陈述句,本来就不是一个问题!)