[ Grammar ]
People believe that the story of big foot ___ by the natives to attract more visitors.
A. must have been made up
B. must have being made up
C. must have been maked up
D. must have been invent
Select your answer:

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The teacher gave us two very difficult exercises.
A. We were given two very difficult exercises.
B. Two very difficult exercises were given to the teacher.
C. Two very difficult exercises were given to us.
D. Both (A) and (C) are correct.