问题
选择题
I think Book 6 is ________ than Book 5.
A．much difficult
B．very difficult
C．more difficult
D．the most difficult
答案
答案：C
题目分析：句意：我想Book 6比Book 5更难。than比，应用比较级，difficult的比较级是more difficult。根据题意，故选C。
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