单项选择题

All ______ live must die.

A．which
B．who
C．that
D．whom
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单项选择题
We should be able to do the job for you quickly, ______ you give us all the necessary information.
A．provided that
B．or else
C．as if
D．in case
单项选择题
Plants can absorb the carbon dioxide through their ______ during the sunlight hours and produce oxygen which human beings need to survive.
A．slots
B．hoses
C．pores
D．sponges
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