问题
选择题
Lisa, now stop for a short break. You should know that you _____ all the morning. [ ]
A. are working
B. had been working
C. have been working
D. have worked
答案
答案：C
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Lisa, now stop for a short break. You should know that you _____ all the morning. [ ]
A. are working
B. had been working
C. have been working
D. have worked
答案：C