单项选择题

We should recognize that every company and every person is part of a long ______ of customers and suppliers.

A．pool
B．line
C．stream
D．chain
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单项选择题
—You are so lucky.—What do you mean ______ that
A．for
B．in
C．of
D．by
单项选择题
A．excuseB．rejectC．helpD．scold
A．excuse
B．reject
C．help
D．scold
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