这是一篇短文，讲到有些人天生有「共感(synesthesia)」， 例如听觉并味觉（听到声音的时候，觉得声音有味道）、不同字母有不同的颜色。 目前科学家初步认为这是基因的关系。 "Currently, synesthesia is not completely understood, but it is believed to be in our genes. Scientists find that the white matter of synesthetes is organized differently from that of people without synesthesia. This may account for the differences in perception. Nontheless, some scientists think all people _____________ with synesthesia only to lose it later on in their lives." (A)were born (B)may be born (C)may have been born (D)may not have been born 空格处答案是C。请问为什麽？A、B、C有什麽不同？谢谢！ --

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