填空题 With early voting under way in dozens of states, Romney was particularly assertive in the 90-minute event that drew {{U}}a{{/U}} television audience likely to be counted in {{U}}tens of millions{{/U}}—like a man intent on {{U}}shaking up{{/U}} the campaign with a little {{U}}less than{{/U}} five weeks to run. A. a B. tens of millions C. shaking up D. less than