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
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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
单项选择题
Crisis would be the right word to describe the in many rare animal species.
A．restriction
B．descent
C．decline
D．minimization
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