— Mum, would you please buy me an MP5 player?
— If you can help do some housework the whole vacation, you have one as a reward.
A. must
B. need
C. would
D. shall
网友回答
A. must
B. need
C. would
(答案→)D. shall
解析：情态动词考查题。A. must “必须”B. need“需要”C. would“会”表将来D. shall“会”表允诺“妈妈给我买一个MP5可以么？”“如果你做一个假期的家务活，你会得到一个MP5。”