单项选择题

If you can ______ punctual delivery, we shall place large orders with you.

A．guarantee
B．convince
C．assure
D．ensure
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单项选择题
The autumn harvest is ______.
A．by hand
B．on hand
C．at hand
D．off hand
单项选择题
It was with great delight that I read in your February ______ the letter written by Prof. Wu.
A．issue
B．copy
C．printing
D．periodical
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