--- What’s the matter? You are like that for a few minutes.
--- Well, it is bound . I’m thinking if we need get the wet clothes back to the room.
A. to rain
B. to have rained
C. rained
D. raining
网友回答
(答案→)A. to rain
B. to have rained
C. rained
D. raining
解析：考查短语搭配。be bound to do必定做某事，句意：一定下雨了，我正考虑我们是否把湿衣服收回家，选A。