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
请问为何要用in which、不用when?为何最后要用with、不用having?
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