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				7．I found      very difficult to understand what the foreigner said．A．it’s           B．its            C．it              D．that			【查看更多】
			


		
     
    


		
    
		
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     -- Did you read a book about customs last week?
    -- Yes, I found ______ very useful to know the customs of foreign countries.
    A. that???????????? B. this???????????? C. it’s??????????? D. it
     
    

			
    
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    I found _____ very difficult to learn  maths  well.
    A．whatB．it C．thatD．this
    

			
    
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    I found _____ very difficult to learn 
maths  well.
    


    A．what             B．it                C．that              D．this
    


     
    

			
    
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    -- Did you read a book about customs last week?
    


    -- Yes, I found ______ very useful to know the customs
of foreign countries.
    


    A.
that             B.
this             C.
it’s            D. it
    


     
    

			
    
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    After visiting different countries, I found
_______ very important to learn about table manners.
    


    A. it                B.
that            C. this              D.
us
    


     
    

			
    
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