Daviad ran as fast as he could in order to catch to catch up with others这是一道选择题,order to catch,还有一个选项是so that he caught,为什么这一项不能选

as fast as he could 是尽可能快的意思，Daviad ran as fast as he could in order to catch to catch up with others中in order to catch to catch up with others是目的状语意思明确，so that 引导结果状语，意思明显不恰当。

so that he could catch

so that he could catch才对
没有情态动词