"He walkd ( ) fast for us ( ) catch up with."应该填“too...to"还是“so...that"?

问题描述:

"He walkd ( ) fast for us ( ) catch up with."应该填“too...to"还是“so...that"?
请说明理由,

too ,to
too…to表示“太……而不能……”,符合题意.