单项选择题

She remains confident and ______ untroubled by our present problems.

A. indefinitely
B. infinitely
C. optimistically
D. seemingly
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As 4 to 8, ______ 8 is to 16.
A. as
B. so

C. that

D. which
单项选择题
We have a high regard for Prof. Joseph because he always ______ his principles.
A. lives on
B. lives up to
C. lives down
D. lives with
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