单项选择题

After I _________ for half an hour, I realized that he was not coming.

A．have waited
B．waited
C．had been waiting
D．was waiting
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_________ still young, Mr. George has had amazing achievement in cosmology.
A．When
B．As
C．Although
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It was not until she got on the bus _________ she remembered she had left her keys at home.
A．when
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