单项选择题

______ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.

A．As
B．Whether
C．While
D．Now that
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It is only when you nearly lose someone ______ fully conscious of how much you value him.
A．do you become
B．then you become
C．that you become
D．have you become
单项选择题
______ that he's already heard the news.
A．Chances are
B．Chance is
C．Opportunities are
D．Opportunity is
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