单项选择题


A．Based
B．Bases
C．Had basing
D．Basing
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单项选择题
Filters and low tar tobacco make smoking safe．
A．Right
B．Wrong
C．Not mentioned
单项选择题
A．another B．other C．each otherD．one another
A．another
B．other
C．each other
D．one another
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