how many restaurants are there in this town?---it's hard ().A to speak B speaking C to say D

答案：C
解析：it's hard to do sth 做某事是难的,排除B和D；另外say和speak的区别是：say 指说话的内容,而speak 指说某种语言或演讲,如
" Let's go to the park." he says.
She can speak three foreign languages.
有不明白的请继续追问,