单项选择题

-- I think it's going to be a big problem.
-- Yes, it could be. I wonder ______ we can do about it.

A．if
B．how
C．what
D．that
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I have no doubt ______ most of the students in our class can pass the final examination.
A．that
B．as
C．weather
D．although
单项选择题
The two roads meet ______ a market lies.
A．at the place
B．where
C．there
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