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          You are too late. The film ______ since half an hour ago. 
          A．has begun B．has been onC．beganD．begins
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查時(shí)態(tài)。句意“你太晚了。電影已經(jīng)開(kāi)始半小時(shí)了。”since從句表示一段時(shí)間，前面用現(xiàn)在完成時(shí)，begin是短暫性動(dòng)詞，不能與一段時(shí)間連用，需要轉(zhuǎn)換為be on。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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