I smoke out of habit, not for pleasure; for I have been in the habit for twenty years.A

I smoke out of habit, not for pleasure; for I have been in the habit for twenty years.
A. a; the
B. the; a
C. x; the
D. x; x

A. a; theB. the; aC. x; the(答案→)D. x; x解析：该题考查冠词的用法。out of habit＝by habit是固定短语，意为“出于习惯，潜意识地”。for pleasure意为“为享乐，为消遣”，也是固定短语。

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