问题详情

Henry is a beggar. He has the habit of picking up cigarette ends left by other people. He can always make one new cigarette out of seven ends. One Saturday night he collected 49 cigarette ends. The next day he made them into cigarettes and smoked them all. How many whole cigarettes did he smoke that day？
A．Ten.
B．Seven.
C．Nine.
D．Eight.此题为多项选择题。请帮忙给出正确答案和分析，谢谢！