请问大家，whether 和whether .. or not 在用法上有没有什么区别？
The commission’s office of compliance, inspection, and investigations plans to intensify its security of stock analysts
to investigate not only whether research is an independent function at brokerage firms,
but also whether conflicts results when analysts own the stocks they write about or when they are paid for their work by a firm’s investment banking division.
A. to investigate not only whether research is an independent function at brokerage firms,
but also whether conflicts results when analysts own the stocks they write about or when they are paid
B. to investigate not only whether research is an independent function at brokerage firms,
but also if conflicts results when analysts own the stocks they write about or they are
C. to not only investigate whether or not research is an independent function at brokerage firms,
but also if conflicts results when analysts own the stocks they write about or are
D. not only to investigate whether or not research is an independent function at brokerage firms,
but also whether conflicts result when analysts own the stocks they write about or are
E. not only to investigate whether research is an independent function at brokerage firms,
but also whether conflicts result when analysts own the stocks they write about or when
这道题答案选择A ,根据not only 。。but also的平行结构直接可以排除BCDE.
但是我很想弄明白whether 和whether or not的区别，麻烦大家给予解释~~谢谢！~
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