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          I was doing my homework _______ my mother was doing some sewing. 
          A．during B．when
          C．while D．a(chǎn)fter
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：A. during在…期間  B. when當(dāng)…時(shí)候 C. while  當(dāng)…時(shí)候D. after在…之后；句意：當(dāng)我的媽媽在縫衣服的時(shí)候，我正在做家庭作業(yè)。while    當(dāng)…時(shí)候，強(qiáng)調(diào)兩個(gè)動(dòng)詞同時(shí)進(jìn)行，故選C
          點(diǎn)評(píng)：when既可以和瞬間動(dòng)詞連用，也可以和延續(xù)性的動(dòng)詞連用，while只能和延續(xù)性的動(dòng)詞連用，同時(shí)while表示兩個(gè)動(dòng)詞同時(shí)進(jìn)行，往往兩個(gè)動(dòng)詞都要用進(jìn)行時(shí)態(tài)的形式。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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