China's high-speed railways _________ from 9,000 to 25,000 kilometers in the past few years.

1. China's high-speed railways _________ from 9,000 to 25,000 kilometers in the past few years.

A. are growing B. have grown C. will grow D. had grown

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—But for the situation where many pig farms _______ a rare pig disease, things would not be like this.

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