根据网考网考试中心的统计分析,以下试题在2018/3/21日托福考试习题练习中,答错率较高,为:94%
【单选题】 Not until the late nineteenth and early twentieth centuries—as a unified science.
A.( did ecology emerge
B.( when ecology emerged
C.( ecology emerged
D.( when did ecology emerge
网考网参考答案:A,答错率:94%
网考网试题解析:
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