1)动词不定时表目的
2)“the key to ”中的“ to ”是介词,即“the key to sth/doing”
_____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.
为什么两个空分别是To control;keeping而不是Controlling;keep?
为什么两个空分别是To control;keeping而不是Controlling;keep?
英语人气：688 ℃时间：2020-06-19 19:36:55
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