There is a great deal evidence__that music activities engage diffferent parts of the brain.（2009浙
这个横线上到底应该填indicating还是to indicate还是两种都可以?
因为人教版高三课本5单元Advertising最后一段有一句
There is no clear evidence to show just how well ads work,but they are important to both companies and consumers.这个地方就是使用的不定式呢!
而且也有资料书上说的：表示“有证据表明……”有以下说法：
There is evidence to show/showing.
Evidence shows.
那这个高考题到底应该怎么分析呢?（它选的indicating)
希望给出答案的朋友们给个详细说明!答案我自己也清楚的!