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
We've ______ all our time and effort in this plan, and we don't want it to fail.
A．invested
B．exhausted
C．devoted
D．assigned
单项选择题
You should know ______ to spend all your money on those impractical fancy goods.
A．other than
B．rather than
C．more than
D．better than
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