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that,which,都引导宾语从句吗?Studies have shown _________ teenagers o

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that,which,都引导宾语从句吗?Studies have shown _________ teenagers often suffer from depression.
Studies have shown _________ teenagers often suffer from depression.正确答案为A
  解析:that 引导宾语从句
  [A] that [B] which [C] in which [D] in that
为什么不选which呢?
that 和which 都能引导宾语从句,但是用that没有实际意义,用which含有"哪一个"的意思.
举个例子:I know that you like to read this book.
I want to know whick book you like to read best of the three.
在上面这两句话种,还可以很清楚的看到that &which的另一个区别
that 没有选择范围
which 是在有范围之内的一种选择
做题目时,根据句意去选择用哪个,比如这题:用that意思已经很完整了:研究表明青少年经常得抑郁症.
这里如果用which,意思就有点牵强.