2. 专升本
  3. _______ pollution is the key to _______ the country a comfortable and clean place to live in.

_______ pollution is the key to _______ the country a comfortable and clean place to live in.

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问题 _______ pollution is the key to _______ the country a comfortable and clean place to live in.
选项 A、To control; keep
B、To control; keeping
C、Control; keeping
D、Controlling; keep
答案B
解析 考查非谓语动词。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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