Exposing yourself to English as much as possible is the key to learning the language well.
考点：the key to ...的关键。expose oneself to：接触。the key to doing sth.：做某事的关键。
句子结构：本句的主语中含有一个动词，所以主语部分可以用主语从句或者非谓语。本句的逻辑主语“人”和“接触英语”是主动关系，所以用现在分词形式。
