单项选择题

One more try, ______ you will succeed.

A．or
B．but
C．so
D．and
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单项选择题
As my exams are coming next week, I'll take advantage of the weekend to ______ on some reading.
A．catch up
B．clear up
C．make up
D．pick up
单项选择题
Water will continue to be ______ it is today—next in importance to oxygen.
A．how
B．which
C．as
D．what
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