问题
选择题
Although the first part of the book is easy， the rest ______.
A．are difficult
B．has proved difficult
C．is supposed difficult
D．have been found difficult
答案
答案：B
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Although the first part of the book is easy， the rest ______.
A．are difficult
B．has proved difficult
C．is supposed difficult
D．have been found difficult
答案：B