问题补充：
Our teacher has some very difficult questions to ask us.
A. put
B. made up
C. made of
D. decided
答案：
A. put
(答案→)B. made up
C. made of
D. decided
解析：短语：made up 组成，编写，made of 组成，句意：我们的老师出了一些非常难的问题来提问我们。所以选B。
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