That it keeps raining cats and dogs the tourists.A. worryB. worriedC. worriesD. worrying

问题补充：

That it keeps raining cats and dogs the tourists.

A. worry

B. worried

C. worries

D. worrying

答案：

A. worry

B. worried

(答案→)C. worries

D. worrying

解析：考查时态.句意;持续的倾盆大雨困扰着游客们.可知本句表述的是过去已发生还要进行下去的动作,故用一般现在时态,选C.