Though having discussed it for long, they still haven’t reached an agreement______they should pour more money into the project.A.thatB.ifC.whetherD.what
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C解析连词辨析。That因为,以至于;if是否,如果;whether是否,不论;what什么。句意:尽管讨论了很久,他们仍旧没有达成协议,是否他们应该想这个项目投资。If还有如果的含义,用if会引起歧义时,只用whether。如用whether可避免歧义。故选C。