23. Of all the possible disasters that threaten American agriculture, the possibility of an adverse change in climate is maybe the more difficult for analysis.
(A) ....
(B) is probably the most difficult to analyze
(C) is maybe the most difficult for analysis.
这题目我倒是做对了,不难。但是,一直不明白它的解释里说的:Maybe must be replaced by probably. 另外,我注意到OG11-2题的解释中说道:Maybe and perhaps are interchangeable; perhaps is slightly more formal.