The science ofeconomics, which for four decades was dominated by Keynesians, who at first stressed the government’s role in stimulating the economy, but who were ultimately led away from solutions based on government intervention.
(A) economics, which for four decades was
--> lack of main verb.
(B) economics that was to be
--> lack of main verb.
(C) economics, one which has, for four decades, been
--> lack of main verb.
(D) economics is one that for four decades has been
--> correct.
(E)
...
(A) economics, which for four decades was
--> lack of main verb.
(B) economics that was to be
--> lack of main verb.
(C) economics, one which has, for four decades, been
--> lack of main verb.
(D) economics is one that for four decades has been
--> correct.
(E)
...



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