-- We hadreally smoggy December this yearI can’t rememberwinter when air was pollute

-- We had really smoggy December this year.
--- I can’t remember winter when air was polluted so severely.
A. a; /
B. a; the
C. the; the
D. a; a

A. a; /B. a; theC. the; the(答案→)D. a; a解析： 句意：今年我们度过了一个雾霾的12月份。--我不记得有一个冬天空气被污染的如此严重的。第一空填a，泛指“一个雾霾的12月份”，第二空填a，泛指“一个冬天”，选D。

回答的不错