单项选择题

Where could my son ______the key I couldn't find anywhere.

A. put
B. have put
C. has put
D. had put
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单项选择题
People used to think that the surface of the moon was smooth, ______
A. don't they
B. wasn't it
C. didn't they
D. usedn't they
单项选择题
The Olympic Games, ______in 776 B. C. , has become the most important sports event in the world.
A. first playing
B. to be first played
C. first played
D. to be first playing
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