新版PREPsc1-177求助

177.
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In her 26 years in the forests of Gombe, Jane Goodall collected data that proved that chimpanzees exhibit the kind of curiosity so that new patterns of behavior and expression can be passed on from each one to others by imitating and practicing

A. exhibit the kind of curiosity so that new patterns of behavior and expression can be passed on from each one to others by imitating and practicing

B. will exhibit the kind of curiosity so that new patterns of behavior and expression can be passed on from one to another by imitating and practicing

C. will exhibit the kind of curiosity so that new patterns of behavior and expression can be passed on from one to another by imitation and practice

D. exhibit the kind of curiosity by which new patterns of behavior and expression can be passed on from one to another by imitation and practice

E. exhibit the kind of curiosity where new patterns of behavior and expression are passed on to others by imitation and practice

我选了B，答案是D。有些疑惑

我承认B中的will时态不好，但是不解D中的by which 用法，有人解释过说这是固定用法，哪位NN能帮忙解释一下？

完全同意Alienx的解释.

以下是我从某国外GMAT论坛上看到那里老师的解释:

this is the only choice that uses "by which", as required by proper idiom. it also uses "imitation and practice" at the end, which is correct (vis-à-vis "imitating and practicing", which don't have a proper noun as referent).

同问。BY WHICH还是没有想通！期待NN解答