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				20．What do I have to do          I want to be  thinner.   A．until         B．since         C．while         D．if  Today more and more families  have their own computers．Parents buy computers  21  their children．They 22  computers can help them improve their studies  in school．However.many of their children  23   computers to play games.to watch videos  24 to sing karaoke instead ofstudying．So many teachers and parents complainthat computers  call not help children study  25   make them fall behind．So computers are put away  26 parents．  In  27  countries.even some scientists also  28  computers．They say computers let many people  29  their jobs or  30  them a lot of trouble．			【查看更多】
			


		
           
          


		
          
		
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          What do I have to do ________ I want to be thinner.
            
          A．until         B．since         C．while         D．if
          

			
          
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          What do I have to do ________ I want to be thinner?
          

          [　　]
          

          

          A．if
          B．since
          

          C．while
          D．until
          

          

          

			
          
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