There are signs ___MP4 has become more popular with the young people Ain which Bthat C how D when为什么选B

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There are signs ___MP4 has become more popular with the young people Ain which Bthat C how D when为什么选B

There are signs ___MP4 has become more popular with the young people Ain which Bthat C how D when为什么选B
There are signs ___MP4 has become more popular with the young people Ain which Bthat C how D when
为什么选B

There are signs ___MP4 has become more popular with the young people Ain which Bthat C how D when为什么选B
__that_MP4 has become more popular with the young people 是一个同位语从句,修饰signs
,解释signs的具体内容.that引导同位语从句,that本身不作任何成分,但不能省略.

这个叫同位语——横线后的句子是对signs内容的具体解释——语法规定必须用that

B