—We need a new leader for our Helping Hands Club but I don’t know.—Why not Mary? She is al

问题补充：

—We need a new leader for our Helping Hands Club，but I don’t know.

—Why not Mary? She is always willing to help others.

A. what to choose

B. how to choose

C. when to choose

D. who to choose

答案：

A. what to choose

B. how to choose

C. when to choose

(答案→)D. who to choose

解析：考查情景交际。“我们的互帮俱乐部需要一个新的领导者，但我不知道......。”“为什么不选玛丽？她总是乐意助人。”考查“疑问词+不定式”作宾语，choose缺少宾语，排除B、C；what指物，who指人。故选D。