单项选择题

No sooner had she entered________ the house the telephone rang.

A．when
B．than
C．as
D．while
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单项选择题
The best title for the passage may be________.
A．Garbage and the Earth
B．Fossil Fuel and Garbage
C．Land and Garbage
D．Garbage—Energy Source
单项选择题
Space vehicles were launched into outer space_________ search of another living planet.
A．to
B．at
C．in
D．for
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