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In just a couple of years, low-carbohydrate diets have accomplished what the government has failed to do in decades of trying: it has convinced the public of refined grains, that they are bad and whole grains are good.
(A) it has convinced the public of refined grains, that they
(B) convincing the public about refined grains, which
(C) convince the public that refined grains
(D) convinces the public of refined grains, they
(E) convincing the public that refined grains
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正确答案：C
解析：Choice (C) is correct. It avoids the awkwardness and wordiness of the original by clearly and concisely stating what the government has failed to do—it has failed to “convince the public that refined grains are bad and whole grains are good.”
往期练习题：
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