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题目内容
（河南科技大学大学英语3(专升本)）
This is the most difficult book ______ .
选项:
A:what I have ever read
B:which I have ever read
C:I have ever read it
D:that I have ever read
选项:
A:what I have ever read
B:which I have ever read
C:I have ever read it
D:that I have ever read
参考答案
