_________ the internet is _________, I do not think it is a good idea to spend too much time on it.
A．When ; helpfulB．As ; great help
C．While ; of great helpD．Now ; of no help
C
考查連詞。句中while作“雖然”之意；be of great help =" very" helpful。句意：雖然網(wǎng)絡(luò)是很有幫助的，但我認為在它上面花太多的時間不是一個好主意。
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