—When _____ visit his aunt?
—Last weekend. [ ]
A. does she
B. do they
C. did he
D. did us
C
香烟中含有下列哪种有害物质( )
A.尼古丁
B.焦油
C.一氧化碳
D.以上都是
一个完整的尺寸应包含尺寸界线、尺寸线及箭头和尺寸数字三个要素。()