单项选择题

I can’t tell you how _____ I am to you for having listened to me.

A．helpful
B．faithful
C．grateful
D．useful
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单项选择题
I need new-heels on these shoes, the present ones are_____.
A．worn down
B．knocked down
C．kept down
D．taken down
单项选择题
We all questioned _____accurate the result was.
A．however
B．why
C．how
D．what
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