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          【題目】By the time he was 4 years old, he ________ 100 English words.
          A. learns B. will have learned C. has learned D. had learned
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】D
          【解析】
          考查過去完成時。句意：到他4歲的時候，他已經(jīng)學會了100個英語單詞。by the time引導的時間狀語從句，從句過去時，主句用過去完成時。故D選項正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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