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______the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.

A.If B.While C.Because D.As

B

解析试题分析:考查连词:本句的意思是:虽然网络对人的帮助很大,但是我并不认为在网络上花费太多时间是个好注意。句子含义的转折性.只有B有此含义.while--当.....时候,虽然.,if如果,because因为,as随着,因为,当…时候,选B。 
考点:考查连词

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