◎ 题干
—When is Jack going to finish writing that program?
—I don't know ______ day in and day out.
[     ]
A. He has been working
B. He has worked
C. He had been working
D. He was working
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据魔方格专家分析,试题“—When is Jack going to finish writing that program?—I don't know ______ day in and day out.[ ]A. He has been workingB. He has workedC. He had been workingD…”主要考查了你对  【现在完成进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。