】有关make 用法有点怪

】有关make 用法有点怪thousands of fish have been washed on the shore ,too far up for them to make ________ back into the water by themselves .a.them b.themselves c.it d.that 答案选择c项 为什么?固定搭配（若是,其义为“成功做了”吗）?还是 形式宾语 make it (将that省略)还是……