问题补充:
the Internet is of great help, I don’t think it’s a food idea to spend too much time on it.
A. If
B. While
C. Because
D. As
答案:
A. If
(答案→)B. While
C. Because
D. As
解析:考查连词:A. If如果,B. While虽然,C. Because因为D. As由于,正如,句意;虽然因特网很有用,但我认为花太多时间在上面不是好主意。选B。