2. 外语
  3. Before you launch your online store, or your new product, it is important to spend time (do) ________ market research.

Before you launch your online store, or your new product, it is important to spend time (do) ________ market research.

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问题 Before you launch your online store, or your new product, it is important to spend time (do) ________ market research.
选项
答案doing
解析 本题考查spend的固定用法，即spend time on sth．／(in)doing sth．。所以空格处应填入do对应的现在分词形式doing。
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