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          It’s two and a half weeks since the exchange students __________ Taixing.
          A．a(chǎn)rrivedB．reached C．have been inD．have arrived in
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          It’s+段時間+ since引導的從句表示自從以來已經(jīng)多久了。Since引導的句子要用過去式，把C，D排除。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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