单项选择题

Susan ______ the magazine the whole morning, yet she hasn't finished it.

A．has read
B．is reading
C．reads
D．has been reading
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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
Some areas, their severe weather conditions, are hardly populated.
A．due to
B．in spite of
C．but for
D．with regard to
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