2. 外语
  3. His efforts to improve the sales of this product have been very (help) ______.

His efforts to improve the sales of this product have been very (help) ______.

admin2008-11-28  35
问题 His efforts to improve the sales of this product have been very (help) ______.
选项
答案helpful
解析 根据句子结构，这里缺一形容词做表语。
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