单项选择题

He paid the boy 10 dollars for washing ten windows, most of ______ hadn't been cleaned.

A. these
B. those
C. that
D. which
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单项选择题
You should use ______ language when you write a business letter.
A. formal
B. political
C. magic
D. plain
单项选择题
I don't have too much time. Could you tell it ______
A. in details
B. presently
C. happily
D. briefly
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