单项选择题

______ still young, Mr. George has had amazing achievement in cosmology.

A．When
B．As
C．Although
D．Since
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单项选择题
All the class burst ______ laughter when they saw the funny picture.
A．in
B．at
C．on
D．into
单项选择题
It was not until she got on the bus ______ she remembered she had left her keys at home.
A．when
B．which
C．that
D．where
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