单项选择题

It was ______ computer games that took the boy a lot of time that he ought to have spent on his lessons.

A．to have played
B．playing
C．played
D．having played
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单项选择题
Preparations are being made for the Olympic Games ______ in Beijing in 2008.
A．held
B．holding
C．to be held
D．to hold
单项选择题
It is ______ his advice on how ______ English well ______ you a lot of trouble.
A．because; to learn; that will avoid
B．taking; to learn; that will save
C．because of; learn; which will waste
D．for; to learn; that will make
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