单项选择题

______ we need air and water, so do we need criticism and self-criticism.

A．Even though
B．So long as
C．Just as
D．Now that
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单项选择题
I don't think it is any use ______ this matter any further.
A．discussing
B．to discuss
C．to discussing
D．to be discussed
单项选择题
Children are always curious ______ everything they see.
A．to
B．for
C．on
D．about
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