问题
                    
In our school library, there____ a number of books on science and the number of them ______ growing larger and larger.
                            A:is, are
B:has, are
C:have, is
D:are, is
                        
                        B:has, are
C:have, is
D:are, is
正确答案是:
                        
                        
                        
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