单项选择题

______is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth
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Who will provide the distribution networks in the joint venture
A．Unilever.
B．Nestle.
C．PepsiCo.
D．Coca Cola.
单项选择题
He had a bad cold. _______ is why he didn’’t come.
A．It
B．This
C．That
D．What
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