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
Do you know the singer and dancer who ______ at the gate
A．is standing
B．are standing
C．is stand
D．standing
单项选择题
The ______ boy was last seen ______ near the East Lake.
A．missing; playing
B．missing; play
C．missed; played
D．missed; to play
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