单项选择题

Since( ) were used in the cargo.a Phytosanitary Certificate should be provided

A．wooden packages
B．cartons
C．plastic packages
D．jumbo bags
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单项选择题
The director gave me a better offer than( )．
A．that of John’s
B．John’s
C．he gave John
D．those of John
单项选择题
Textile business has become more and more difficult ( )the competition grew．
A．as
B．befor
C．since
D．after
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