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It is no longer a question now______ the Chinese astronauts

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It is no longer a question now______ the Chinese astronauts can wave our national flag in Outer space.
A．where B．whether C．that D．what
为什么不选B,能否……已经不再是一个问题.
1、正解：
that引导主语从句表示已知，whether表示未知。选that.
若题干表述为It is a question …用whether表未知。
2、补充：
“能否怎样已经不是一个问题”和“能怎样已经不是一个问题”在语文上都是正确的句子。
3、反思：
英语语法有固定的规则，不能用汉语语法解释英语语法。
It is no longer a question now______ the Chinese astronauts
不是强调句,也不是定语从句,应该是一个名词性从句.(the Chinese astronauts can wave our national flag in Outer space.)is no longer a question now
可以看出这是个主语从句,It 是形式主语,真正的主语是that 从句,即陈述的这个事实.为了避免头重脚轻,把真正的主语放在了句子的后部.中国宇航员在太空挥动我们的国旗已经不再是个问题了.
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