There is no conceivable reason why there should be any difficulty during the project. The underlined part can be replaced by all the following EXCEPT______.(2014-78)
【正确答案】 D
【答案解析】解析：conceivable表示“可想到的，可想象的，可能的”，正好和选项A、B和C的含义相对应；observable则指“看得见的，觉察得到的”。