2. 专升本
  3. While ______ , I often notice that some students are absent-minded (心不在焉的).

While ______ , I often notice that some students are absent-minded (心不在焉的).

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问题 While ______ , I often notice that some students are absent-minded (心不在焉的).
选项 A、teach
B、teaching
C、taught
D、to teach
答案B
解析 while／when／before／after／as soon as等词后面+动词时，用动词的doing形式。
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