問題詳情：
----You’re coughing badly, Martin. Why not give up smoking?
---Give up smoking? Easier said than done, Amy. Once you ________ the habit of smoking, it is very hard for you to _______ .
A. keep up; break it away B. take up; drop it out
C. pick up; get rid of it D. build up; do away with it
【回答】
C
知識點：動詞時態與語態
題型：選擇題
