That little boy has some trouble in public.A. to speakB. speakC. speaks D. speaking

问题补充：

That little boy has some trouble in public.

A. to speak

B. speak

C. speaks

D. speaking

答案：

A. to speak

B. speak

C. speaks

(答案→)D. speaking

解析：考查固定结构。Have trouble （in）sth/doing sth某事或者做某事有麻烦，in可以省略，故选D。