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          Don’t be afraid of asking your teachers for help ________it is needed.
          A．a(chǎn)sB．since
          C．unlessD．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          解析　考查連詞。句意為：如有需要，不要害怕向老師求助。此處when相當(dāng)于if，表示條件，其他不符合語意。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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