问题
选择题
Better take a break. You ______ the Internet for more than three hours. [ ]
A. are surfing
B. surfed
C. have surfed
D. have been surfing
答案
答案：D
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Better take a break. You ______ the Internet for more than three hours. [ ]
A. are surfing
B. surfed
C. have surfed
D. have been surfing
答案：D
