a small study advanced the notion that listening to Mozart's Sonata for two Pianos in D Major could boost mental functioning
一个研究小组,考察了关于倾听莫扎特的D大调双钢琴奏鸣曲可以促进大脑机能的说法
that 引导同位语从句,就是说listening to Mozart's Sonata for two Pianos in D Major could boost mental functioning 是notion的同位语,然后再分析这个从句,我们可以知道could boost是从句的谓语,那么listening to Mozart's Sonata for two Pianos in D Major 就是这个从句的主语,然而动词的现在分词或者不定式才能作主语,所以listen这个动词想要做主语,要么变成ing形式,要么变成listen to...不知道你懂没懂...