bmwhype2 wrote:
The energy source on Voyager 2 is not a nuclear reactor, in which atoms are actively broken apart; rather a kind of nuclear battery that uses natural radioactive decay to produce power.
(A) apart; rather
(B) apart, but rather
(C) apart, but rather that of
(D) apart, but that of
(E) apart: it is that of
rather is adverb not a conjuction which connect two similar word/entities. but is conjuction. rather can suplement the meaning to "but". in choice b, we can eliminate "rather".
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