_______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
A．IfB．WhileC．BecauseD．As
B
B 本題考查連詞的用法。句意：雖然因特網(wǎng)很有用處，但我認為在網(wǎng)上花太多的時間不是個好主意。if引導(dǎo)條件狀語從句；because引導(dǎo)原因狀語從句；while和as都可作“雖然，盡管”將，都可以引導(dǎo)讓步狀語從句，但as引導(dǎo)讓步狀語從句時要部分倒裝，while引導(dǎo)的讓步狀語從句用正常語序，且常放在主句的前面。
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