______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
A．IfB．AsC．BecauseD．While
D
考查連詞的用法。While 雖然，盡管，句意：盡管網(wǎng)絡(luò)有很大的幫助，但是我認(rèn)為把太多時間花在上面不是一個好主意。故選D。
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