单项选择题

-- I really don't know how to thank you enough.
--______.

A．No problem
B．Think nothing of it
C．Not at all
D．It doesn't matter
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单项选择题
How to raise the efficiency, ______ is the question.
A．what
B．which
C．that
D．if
单项选择题
The thief ______ the lock of the lady's jewelry case open.
A．hit
B．forced
C．stole
D．broke
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