单项选择题

It was in China______the agreement was signed.

A．what
B．which
C．that
D．where
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单项选择题
-Who lives in this room -______.
A．None
B．No one
C．No
D．Nothing
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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