337. Idioglossia is a phenomenon, incompletely understood at best, where two persons develop a unique and private language with highly original vocabulary and syntax.
(A) where two persons develop a unique and private language with
(B) when two persons develop a unique and private language having
(C) in which two persons have unique and private language development with
(D) having two persons who develop a unique and private language that has（E）
(E) in which two persons develop a unique and private language with
我先的是A, 查了一下网上的说明.
'where' vs 'in which'
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'In which' is more precise than 'where' in defining location as in: This is the box in which she keeps her pearls. This is the place where she keeps her ... | 如果只是在表明地点的时候用in which更好, phenomenon并不是地点的意思. 所以个人认为应该选A. 各位请指教. | 
