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The book is not easy.____ it's rather difficult.

A. On the one hand                                                     B. On the contrary 

C. On the other hand                                                           D. On the other contrary

The book is not easy.____ it's rather difficult.

A. On the one hand                                                     B. On the contrary 

C. On the other hand                                                           D. On the other contrary

The book is not easy.____ it's rather difficult.

A. On the one hand                                                     B. On the contrary 

C. On the other hand                                                           D. On the other contrary

The book is not easy.____ it's rather difficult.

A. On the one hand                                                     B. On the contrary 

C. On the other hand                                                           D. On the other contrary

The book is not easy.____ it's rather difficult.

A. On the one hand                                                     B. On the contrary 

C. On the other hand                                                           D. On the other contrary