1道高中英语单选.I just don`t understand _____ that prevents so many

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1道高中英语单选.
I just don`t understand _____ that prevents so many Americans from being as happy as one might expect.
A.why it does
B.what it does
C.what it is
D.why it id

我只是不明白是什么让这么多美国人停止了人所共盼的欢乐.
后面的from being as happy as one might expect就是人所期盼的尽可能的欢乐/幸福.
what is it that prevents…… 是什么阻止了……
懂了没有?

1道高中英语单选.I just don`t understand _____ that prevents so many I just don’t understand_______ that prevents so many America I just don't understand __that prevents so many Americans fr 谁能帮我解释下这个为什么选C阿I just don't understand (. )that prevents so i just don't understand___that prevents so many Amerians fro I try to understand ------that prevents so many people from When I try to understand —— that prevents so many Americans I try to understand _____ that prevents Mary from attending when I try to understand___it is that prevents so many 一道英语单选There are so many kinds of dresses that I don't know _ I Just Don T Understand 歌词 I just don't understand是什么意思