问题
选择题
All these questions fill my head, making _____ for me to sleep well at night. [ ]
A. it is difficult
B. it difficult
C. difficult
D. it difficulty
答案
答案：B
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All these questions fill my head, making _____ for me to sleep well at night. [ ]
A. it is difficult
B. it difficult
C. difficult
D. it difficulty
答案：B