题目内容：
—______you know, David has been well lately.
A. Which B. As C. What D. When
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
选择题：—______you know, David has been well lately.A. Which B. As C. What D. When
- 题目分类： 大学英语B级
- 题目类型：选择题
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《卷烟》国标规定，卷烟烟气一氧化碳量“高”是指一氧化碳量（）。A．≤10mgB．11～15mgC．＞15mgD．≥25mg
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