单项选择题

______ what to do, the man telephoned the police.

A．Not known
B．Not knowing
C．Don't know
D．Knowing not
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单项选择题
______ the worse I seem to feel.
A．When I take more medicine
B．The more I take medicine
C．The more medicine I take
D．More medicine I take
单项选择题
Anyone can borrow books from the library ______ he has a library card.
A．since
B．so long as
C．even though
D．unless
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