问题
选择题
_________ the internet is _________, I do not think it is a good idea to spend too much time on it.
A．When ; helpful
B．As ; great help
C．While ; of great help
D．Now ; of no help
答案
答案：C
考查连词。句中while作“虽然”之意；be of great help =" very" helpful。句意：虽然网络是很有帮助的，但我认为在它上面花太多的时间不是一个好主意。