OG SC 一道题672 求助

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问题：1.in order to  finish 和C选项中in fininshing 和 E选项 ，finishing 有什么区别？？?此题正确答案B。 我可以根据平行选出正确答案 但是不懂in order to 和finishing 这个点 。

2.D 选项中 that being someone  和 E选项 being someone 有什么区别 ？？？

At the end of the 1930s, Duke Ellington was looking for a composer to assist him—someone not only who could arrange music for his successful big band, but mirroring his eccentric writing style as well in order to finish the many pieces he had started but never completed.

A.someone not only who could arrange music for his successful big band, but mirroring his eccentric writing style as well in order to finish

B.someone who could not only arrange music for his successful big band, but also mirror his eccentric writing style in order to finish

C.someone who not only could arrange music for his successful big band, but also to mirror his eccentric writing style in finishing

D.that being someone who could not only arrange music for his successful big band, but mirroring his eccentric writing style for finishing

E.being someone not only who could arrange music for his successful big band, but mirror his eccentric writing style as well, finishing