问题
                    
What do you think of the book ——Oh, excellent. I never doubt_____ It is worth _____a second time.
                            A:if ; reading
B:whether ;to be read
C:if ; being read
D:that ; reading;
                        
                        B:whether ;to be read
C:if ; being read
D:that ; reading;
正确答案是:
                        
                        
                        
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