The traffic was too busy.So they were late 同义句转换The traffic

填 therefore 因此,所以
再问： 2个空怎么填
再答： 如果结构是：The traffic was too busy（ ） they were late。 能填的是一个空therefore 或三个空： as a result （SORRY， 我想不出两个空填的是什么） 但如果是 They were late ( because of) the busy traffic . 这种结构就是填 because of