问题
选择题
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
答案
答案：B
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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
答案：B