16. ____ a solution to the problem of a future energy shortage, but it also helps to eliminate environmental
pollution.
(A) The new energy source provides
(B) The new energy source provides not only
(C) Not only the new energy source provides
(D) Not only does the new energy source provide
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倒裝 be+V 助v+主+v has+主...
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Not only does the ne...
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