问题
选择题
There are a lot of useful things on the Internet, but________,there is something unhealthy on it. [ ]
A. by the time
B. at the same time
C. all the time
答案
答案：B
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There are a lot of useful things on the Internet, but________,there is something unhealthy on it. [ ]
A. by the time
B. at the same time
C. all the time
答案：B