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
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
单项选择题
But for your help, I _________ my work yesterday.
A．can't finish
B．wasn't able to finish
C．couldn't finish
D．couldn't have finished
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