____ 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

試題分析：句意,上文,盡管因特網(wǎng)很有用,下文，我認(rèn)為花太多的時間在其中并不好。If 如果，As的意思是由于，盡管，但as 作“盡管”講時要使用倒裝;because 因?yàn)椋簑hile意思是盡管/雖然;當(dāng)。。。的時候故選D.
點(diǎn)評：解答此類題型首先要確定上下文關(guān)系,根據(jù)前后文關(guān)系確定適當(dāng)連詞.注意一詞多意，如while意思是盡管/雖然;當(dāng)。。。的時候。As的意思是由于，盡管。還要while和as作“盡管” 的區(qū)別：as 作“盡管”講時要使用倒裝
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