单项选择题

It's a pleasure ( )be of help.

A．to
B．for
C．form
D．on
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单项选择题
While we appoint an agent, it is usual to make the appointment ( ).
A．in writing
B．on paper
C．with writing
D．write down
单项选择题
The production of computer in China is significant, ( ) one million annually.
A．amounts to
B．at the amount of
C．amounting to
D．amounting
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