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
From his ______ eyes, we can see that he is ______
A．puzzling; puzzled
B．puzzling; puzzling
C．puzzled; puzzling
D．puzzled; puzzled
单项选择题
Britain has recently had a high level of unemployment and the same is true ______ many other countries.
A．at
B．from
C．of
D．to
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