long before before long哪个可以引导从句?要准的

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long before before long哪个可以引导从句?要准的
long before before long哪个可以引导从句?要准的

long before before long哪个可以引导从句?要准的
1.long before 可以引导从句：
This all happened long before you were born.
2 before long 为时间状语表示soon or in a short time
It's likely that the law will be abolished before long.

before long当作副词使用，意为不久以后，不可以引导从句。
long before指在某事之前很久，由于before在此是介词，因此可以引导从句。

before long 同楼上;long before 是短语连词或短语介词，意思是”在．．．．之前很久”，后接名词性短语或从句，作时间状语．

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