问题
选择题
With so many people ____ the Internet, it is difficult to see online movies at the same time. [ ]
A. surf
B. to surf
C. surfing
D. surfed
答案
答案：C
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With so many people ____ the Internet, it is difficult to see online movies at the same time. [ ]
A. surf
B. to surf
C. surfing
D. surfed
答案：C
