当前位置：__________ pollution i
单选题 __________ pollution is the key to __________the country a comfortable and clean place to live in.
A.To control ； keep
B.To control ； keeping
C.Control ； keeping
D.Controlling； keep
正确答案： B
答案解析: 考查不定式短语作主语表目的。the key to(doing) sth．指“做某事的关键之处”。to为介词，后跟V-ing形式。句意为：“如果一个国家想拥有一个舒适干净的居住环境，控制污染是关键。”故选B项。
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