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          It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.
          A．sinceB．beforeC．a(chǎn)fterD．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：考查連詞和句型：A. since 自從，B. before 在…前面，C. after在…后面，D. when當(dāng)…時(shí)候，句意：可能還要5-10年人們才能發(fā)現(xiàn)月球上有個(gè)太空站。使用了句型：It may be+一段時(shí)間+before….“要…長(zhǎng)時(shí)間才能夠”，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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