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
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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
单项选择题
My teacher speaks to me ______she were my mother.
A. even though
B. if
C. even if
D. as if
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