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 The mobile phone has influenced people's life a lot since it     .A. invents B. inventedC. is inve...

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deny the existence of mobile phone radiation.  develop new technology to reduce mobile phone radiation.  try to prove that mobile phones are not harmful to health.  hold that the amount of radiation is too small to worry about.  
changed    is changing    has changed    will change  
invents   invented   is invented   was invented  
until    since    before    after  
deny the existence of mobile phone radication.  develop new technology to reduce mobile phone radiation.  try to prove that mobile phones are not harmful to health.  hold that the amount of radiation is too small to worry about.  
cured.  removed.  discovered.  caused.  
left    has left    is left    was left  
invents    invented    is invented    was invented  
invents    invented    is inventing    was invented  
Is this your mobile phone?    This is your mobile phone number.   What’s your mobile phone number?    Your mobile phone number is what  
where has she gone    where has she been   where she has gone    where she has been  
deny the existence of mobile phone radiation.  develop new technology to reduce mobile phone radiation.  hold that the amount of radiation is too small to worry about.  try to prove that mobile phones are not harmful to healt