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          ---How did you work out the difficult chemistry problem?
          --- I worked it out by ________.
          A．working with a groupB．think very hard
          C．a(chǎn)sk the teacher for helpD．doing oneself
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意：你是如何解決這個(gè)化學(xué)難題的？下文by是介詞，表示通過(guò)某種方式，后面接名詞或者動(dòng)名詞作賓語(yǔ)，選項(xiàng)A表示通過(guò)小組合作，選項(xiàng)D語(yǔ)義不符，結(jié)合語(yǔ)境可知選A。
          點(diǎn)評(píng)：英語(yǔ)中原形動(dòng)詞一般只能用作句子的謂語(yǔ)，不能用作介詞或者動(dòng)詞的賓語(yǔ)等句子成分。解答此題還需要了解各個(gè)短語(yǔ)的基本含義及用法的不同，同時(shí)注意其表示多個(gè)含義的現(xiàn)象，然后結(jié)合語(yǔ)境選擇合適答案。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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