问题补充：
Keeping a diary is good habit. Stick to it, and you will make good progress in writing.
A. a; /
B. a: a
C. the; a
D. /; a
答案：
(答案→)A. a; /
B. a: a
C. the; a
D. /; a
解析：考查冠词。句意：坚持写日记是个好习惯，坚持住，你就会在写作方面取得巨大进步。结合语境可知前一空泛指任何一个好习惯，故用不定冠词。下文为短语make progress，progress此处为抽象名词，泛指不用冠词，故选A。
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