单项选择题

The exchange ______ of the pound has fallen against the dollar.

A．amount
B．currency
C．rate
D．worth
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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
单项选择题
She didn't come to the party, though she ______ us she would.
A．offered
B．accepted
C．agreed
D．promised
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