单项选择题

The quality infects had existed prior to______。

A．shipment
B．ship
C．cal
D．airplane
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单项选择题
The weight ______ is attributed to breakage of the gunny bags
A．short
B．shortage
C．shortest
D．long
单项选择题
Representative samples ______ taken by the inspector from the whole yesterday.
A．was
B．is
C．were
D．are
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