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          Robert is away. He _______ America since last week.
          A．has been toB．has joined a club in
          C．has studied inD．has become a manager in
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意：Robert走了。他從上個(gè)星期開始就在美國(guó)學(xué)習(xí)了。時(shí)間狀語(yǔ)是since last week，因此要選延續(xù)性動(dòng)詞。Have beem to“表示去哪后并已回來(lái)了”；join和become都是點(diǎn)動(dòng)詞，故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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