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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单项选择题
--I think he is in Class 5.--Yes, that's ______ .
A．OK
B．wrong
C．right
单项选择题
The doctor asked the child' s parents ______ .
A．what is the problem
B．what was the problem
C．what the problem was
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