【题目】My uncle hasn't been able to quit smoking, but at least he has ______.
A.cut out
B.cut down
C.cut up
D.cut off

【答案】B
【解析】考查动词短语：A. cut out 剪掉，B. cut down砍倒，减少，C. cut up切碎，D. cut off切断，句意：我叔叔还不能戒烟，但至少他已经减少了。选B。