单项选择题

She lost her balance and _____if she hadn’t supported herself.

A．would have fallen
B．had fallen
C．fell
D．would fall
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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
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
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