---Why did you stop writing?
--- I my writing paper.
A. ran out of
B. have been used up
C. have used up of
D. have run out
网友回答
(答案→)A. ran out of
B. have been used up
C. have used up of
D. have run out
解析：这题考查词组：run out of“用完”，句意是;我的作文纸用完了。B项use up也是“用完”，但不是被动，D项run out是不及物动词短语。选A。