Question

【题目】Taking exercise is the key ______ your health.

A. to improve B. to improving

C. in improving D. of improving

Answer 1

【答案】B

【解析】

考查固定短语及动名词。句意：锻炼是改善健康的关键。名词短语the key to….意为“...的关键”，其中to是介词，后面要接名词或动名词做宾语。所以动名词improving your health做to的宾语。故B项正确。