—Why did you stop writing?
— I my writing paper.
A. have used up of
B. have been used up
C. ran out of
D. have run out
网友回答
A. have used up of
B. have been used up
(答案→)C. ran out of
D. have run out
解析：考查固定词组的用法。Use up sth=run out of sth用完sth;或者 sth run out; A多了of; B多了been; D少了of.应该选择C。