问题
选择题
—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
答案
答案：C
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。