— What is he busy doing? — Doing the experiment _____ (complete) the science project.
2023-01-08 07:12:50 173次 2014-2015学年江苏余桥实验学校九年级12月阶段性教学质量调研英语试卷（解析版） 补充句子 反馈错误 加入收藏 正确率 : 100%
题目内容：
— What is he busy doing?
— Doing the experiment _____ (complete) the science project.
本题链接：
