单项选择题

The discovery of these tombs is__________for scholars' studying Chinese history.

A．of very important
B． great significant
C．of great significance
D．greatly importance
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______is known to us all is that the 2012 Olympic Games will be held in London.
A．It
B．What
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She became the first woman to enter the school but withdrew after a few days_____stress.
A．because of
B． in spite of
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