单项选择题

—You are so lucky.—What do you mean ______ that

A．for
B．in
C．of
D．by
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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
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
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