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
It can be safely ______ that there is no living beings on that planet.
A．resumed
B．assessed
C．assumed
D．assured
单项选择题
All students in the class ______ a loud laugh when the professor told them a joke.
A．let up
B．let down
C．let off
D．let out
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