问题
                    
It is very kind ______ you to help me with my lessonsbecause it is very difficult ______me to learn them well.
                            A:of; for
B:of; of
C:for; of
D:for; for
                        
                        B:of; of
C:for; of
D:for; for
正确答案是:
                         
                        
                        
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