问题
                    
I think ____ of the materials I listened to at the beginning of the exam ____ easy.
                            A:three fourths; is
B:third four; are
C:three fourths; are
D:three fourth; are
                        
                        B:third four; are
C:three fourths; are
D:three fourth; are
正确答案是:
                        
                        
                        
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