2. 外语
  3. Tom is studying Chinese and his understanding of proper Chinese needs to (improve) ______.

Tom is studying Chinese and his understanding of proper Chinese needs to (improve) ______.

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问题 Tom is studying Chinese and his understanding of proper Chinese needs to (improve) ______.
选项
答案be improved
解析 need在这里是“需要”的意思，后面可以接动名词，相当于不定式的被动形式，即need doing=need to be done。
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