He was able to arrive there on time.The bus ran more slowly than before.保持原句意思（请说明理由）The bus ran _so_ slowly than before _that _ he wasn't able to arrive there on time.这么做对吗?补充：一个空一词

He was able to arrive there on time.The bus ran more slowly than before.保持原句意思（请说明理由）The bus ran _so_ slowly than before _that _ he wasn't able to arrive there on time.这么做对吗?补充：一个空一词
He was able to arrive there on time.The bus ran more slowly than before.
保持原句意思（请说明理由）
The bus ran _so_ slowly than before _that _ he wasn't able to arrive there on time.这么做对吗?
补充：一个空一词

He was able to arrive there on time.The bus ran more slowly than before.保持原句意思（请说明理由）The bus ran _so_ slowly than before _that _ he wasn't able to arrive there on time.这么做对吗?补充：一个空一词
The bus ran more slowly than before so that he wasn't able to arrive there on time.
这样才可以.不能省略more,more修饰slowly,表比较级.