单项选择题

Please indicate on the enclosed copy of your order form ______ you want to place a cash order now.

A．when
B．whether
C．until
D．unless
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单项选择题
We wish to introduce ______ the largest exporter of fabrics of high quality in China.
A．that we are
B．in that we are
C．ourselves as
D．ourselves being
单项选择题
You may contact the Bank of China for any information concerning our credit ______.
A．stand
B．standing
C．understand
D．understanding
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