单项选择题

Wait until you are more ______ . It's better to be sure than sorry.

A．inspired
B．satisfied
C．calm
D．certain
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单项选择题
His health is ______ .
A．as poor as, if not poorer than, his sister's
B．as poor, if not poorer than, his sister
C．poor as his sister's if not poorer
D．as poor, if not poorer than, his sister's
单项选择题
The reason he has been such a success ______ he never gives up.
A．is what
B．is that
C．is because
D．is
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