单项选择题

All ______ is a continuous supply of fuel oil.

A．what is needed
B．that is needed
C．the thing is needed
D．for heir needs
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单项选择题
The sea separates Taiwan ______ the Chinese mainland.
A．at
B．into
C．from
D．of
单项选择题
When the ship was caught in a strong storm at the sea, the captain ______ a danger signal.
A．sent for
B．sent off
C．sent out
D．sent around
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