—Whyhaven’tyoufinishedyourhomeworkyet? —Theproblemare...
来源:语文精选馆 9.21K
问题详情:
—Why haven’t you finished your homework yet ?
—The problem are so difficult. I ______ hard without stop all day.
A. have been working B. worked C. have worked D. work
【回答】
A
知识点:动词时态与语态
题型:选择题