单项选择题

Though it was late in the night, _________ he continued to work vigorously.

A．but
B．yet
C．and
D．that
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单项选择题
All the flights _________ because of the snowstorm, we had to take Ihe train instead.
A．were canceled
B．had been canceled
C．having canceled
D．having been canceled
单项选择题
The doctor advised him to stay in bed, saying he was much _________.
A．ill enough
B．too ill
C．so ill
D．very ill
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