While________the article, I was wondering whether e-books would replace print bo

游客2023-09-19  27

问题 While________the article, I was wondering whether e-books would replace print books soon.

选项 A、reading
B、read
C、was reading
D、to read

答案 A

解析 根据语法分析,所填空格处省略了主语和be动词。故选A。
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