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。
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