第58题填changing,changing...与pushing...并列,用作伴随状语,可以转化为并列句:
But Cobb and others are now questioning that idea, and they push conferences to provide more chances to participate remotely, and (they) change their personal behavior to do their part in dealing with the climate change crisis.
句意:但科布和其他人现在正在质疑这一想法——他们推动会议主办方提供更多远程参会的机会, 同时改变他们的个人行为, 为应对气候变化危机贡献力量。