GMAT考试

根据网考网考试中心的统计分析，以下试题在2018/9/26日GMAT考试习题练习中，答错率较高，为：73%
【单选题】To maintain a high demand for their product, the manufacturers first took over the marketing and sales functions previously performed by outside agents; next, they began changing their advertising campaigns monthly to keep pace with the rapid changes in consumers' lives.（）
(A) they began changing
(B) this began changing
(C) the former began changing
(D) to begin changing
(E) to change

网考网参考答案：A，答错率：73%
网考网试题解析：
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