—Will you buy me a new iPod Dad?—OK. You have one if you promise to take care of it. A. m

问题补充：

—Will you buy me a new iPod, Dad?

—OK. You have one if you promise to take care of it.

A. might

B. must

C. could

D. shall

答案：

A. might

B. must

C. could

(答案→)D. shall

解析：本题考查情态动词。句意：如果你答应好好利用它，你会有一个的。此处shall是情态动词，有二三人称连用，表示说话人的承诺。