单项选择题

We give you on the attached sheet full details regarding packing and marking, which must be strictly ( ).

A．observed
B．abide by
C．submitted
D．seen
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单项选择题
I'll give you this sample to ( ) wants to have it.
A．whomever
B．whoever
C．someone
D．anyone
单项选择题
( ) barter trade, we mean to pay for your products with our goods.
A．For
B．By
C．As of
D．With
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