[size=14.44444465637207px]Before the 1960's, thirteen percent of adult Americans were college graduates, but the expansion of the educational system increased such an amount up to thirty-three percent by 1980. [size=14.44444465637207px]A. increased such an amount up to [size=14.44444465637207px]B. increased this figure to [size=14.44444465637207px]C. increased such a number to [size=14.44444465637207px]D. has upped such a number to [size=14.44444465637207px]E. increases the total to [size=14.44444465637207px]这题正确答案B 我错选了A,对选项分析的不知道对不对 [size=14.44444465637207px]A错是不是因为amount修饰不可数名词?B是正确答案,figure与13%比较;C错,应该是such number to;D错因为用了现在完成时;E时态错
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