To lose themselves in the netbar( 网吧) _________on teenagers' future life.A.have a bad effect B.has a bad effectC.have a good effect D.has a good effect为什么不选a

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To lose themselves in the netbar( 网吧) _________on teenagers' future life.A.have a bad effect B.has a bad effectC.have a good effect D.has a good effect为什么不选a
To lose themselves in the netbar( 网吧) _________on teenagers' future life.
A.have a bad effect B.has a bad effect
C.have a good effect D.has a good effect
为什么不选a

To lose themselves in the netbar( 网吧) _________on teenagers' future life.A.have a bad effect B.has a bad effectC.have a good effect D.has a good effect为什么不选a
动词不定式做主语时,就相当于形式主语it,所以谓语动词用第三人称单数.

主语 to lose themselves .. 可以看作是个单数形式 所以用第三人称单数 选B