【题目】Companies seem cautious investing more money in research and development.
在线课程【答案】about/of
【解析】 固定词组：be/seem cautious about/of对……小心, 故填about/of。
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Companies seem cautious investing more money in research and development.
编辑：chaxungu时间：2026-04-27 03:02:17分类：高中英语题库
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