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           It was quite a long time ______ I figured out what had happened to the manager.
          A．a(chǎn)fterB．beforeC．when 　　　　D．since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：有很長(zhǎng)時(shí)間我才弄清經(jīng)理發(fā)生了什么。這句話用了固定句型：It was+一段時(shí)間+before+從句，表示“過(guò)了很長(zhǎng)時(shí)間才/就….”如果是It is+一段時(shí)間+since…，自從…有多久了，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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