1. help 应该是三单式 helps,因为主语是抽象名词,即一门学科 horse psychology.
2. pressing a button 应该是 you press a button,因为pressing是主动式,但主语a vacuum cleaner不能发出这个动作.
3. has gained 宜改为 have gained.
SAT语法题：Horse psy chology,a science that investigates the rea
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