2. 外语
  3. Although the first part of the book is easy, the rest______.

Although the first part of the book is easy, the rest______.

admin2010-02-22  51
问题 Although the first part of the book is easy, the rest______.
选项 A、are difficult
B、has proved difficult
C、is supposed difficult
D、have been found difficult
答案B
解析
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