单项选择题

It was courageous ______ Mr. Dorris to try to save the drowning man.

A．for
B．of
C．about
D．with
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单项选择题
You can be sure that he is some what ______.
A．in 30 years old
B．in the thirties
C．in thirty years
D．in the thirty
单项选择题
He ______ himself with a false beard and a pair of sunglasses.
A．hid
B．covered
C．concealed
D．disguised
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