单项选择题

Both air and water ______ what most creatures cannot live without.

A．is
B．are
C．was
D．were
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单项选择题
______ you are young, you will be blessed with beauty, hope, cheer, courage and power.
A．So long as
B．Although
C．In case
D．In that
单项选择题
Nobody can explain the reason ______ the project was abandoned two years ago and then renewed earlier this year.
A．by which
B．why
C．which
D．how
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