单项选择题

Dr. Johnson ______ the patient of the safety of the operations.

A．guaranteed
B．confirmed
C．assured
D．entrusted
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单项选择题
She stared into the overwhelming darkness, wondering if he was as aware of her presence as ______.
A．she was of his
B．she was of him
C．she did of him
D．she did of his
单项选择题
A million years ______ but a brief span in the history of our planet.
A．have been
B．are
C．is
D．has been
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