单项选择题

What do you mean ______ "Help yourself to some fish"

A．for saying
B．to speaking
C．by saying
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When she listens to a talk, she likes to sit ______.
A．in front
B．at front
C．in front of
单项选择题
—I'm sorry I can't do it.—______.
A．Not at all
B．You are welcome
C．It doesn't matter
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