The smart phone benefits us a lot, but the bad effect ______ has on the youth can not be ignored.

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问题 The smart phone benefits us a lot, but the bad effect ______ has on the youth can not be ignored.

选项 A、that
B、which
C、it
D、one

答案C

解析 but连接两个并列的句子，此时it指代前面的smart phone。故答案选C。

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小学英语

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