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          We haven't settled the problem of ________ it is necessary for him to study abroad.
          A．whyB．whether
          C．what D．how
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          B 考察賓語從句。此處的whether是否，引導(dǎo)一個(gè)賓語從句作為介詞of的賓語。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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