单项选择题

It was because he had made such great contribution to the world peace ______ he won the Nobel Prize for Peace.

A．that
B．so
C．since
D．before
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单项选择题
The exchange ______ of the pound has fallen against the dollar.
A．amount
B．currency
C．rate
D．worth
单项选择题
Mary has a curious expression on her face as though she ______ about something.
A．is smiling
B．were smiling
C．smiles
D．has smiled
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