单项选择题

Mary regretted( )to John’s birthday party last Sunday.

A．not going
B．not to go
C．not having heen going
D．not to be going
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单项选择题
The complicated chain of events refers to( ).
A．the passing of information and making of decisions
B．the meeting and hitting back of the ball
C．the coordinated movements of our eyes, brain and muscles
D．a lot of practice before playing tennis
单项选择题
Why did the country mentioned in the passage suffer from floods and starvation
A．Because an empire was set up
B．Because the empire fell to pieces
C．Because it lost its trees
D．Because too much had been spent on wars
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