2. 外语
  3. Mother was busy ______ when you rang up.

Mother was busy ______ when you rang up.

admin2009-08-17  46
问题 Mother was busy ______ when you rang up.
选项 A、to cook
B、cook
C、cooking
答案C
解析 短语：be busy doing sth．忙着做某事。
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