单项选择题

She ______ on this essay for twenty minutes but she has written only about a hundred words.

A．will be working
B．worked
C．has been working
D．will have worked
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单项选择题
She said that she ______ much progress since she came here.
A．makes
B．made
C．have made
D．had made
单项选择题
I know nothing about the young lady ______ she is from Beijing.
A．except
B．except for
C．except that
D．besides
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