单项选择题
______ the knowledge, he didn't know how to ask the way.
A．Knowing not
B．Having not known
C．Not knowing
D．Not to know
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单项选择题
The book ______ interesting, but it's very instructive.
A．can't be
B．may not be
C．should not be
D．might be
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单项选择题
This kind of coffee is different
A．and it is also better
B．from the other, and better
C．and better than the other
D．but also better than others
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