单项选择题

The result of pain is to ______.

A．let us know what's going on
B．make us open to torture
C．make us pay for our sensitivity
D．help us get more sensations
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单项选择题
Rarely ______ such a terrible sight.
A．I have seen
B．have I seen
C．I saw
D．had I seen
单项选择题
After the interview, he had a very ______ expression on her face.
A．excited
B．exciting
C．being excited
D．excite
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