单项选择题

The bird began to dance______.

A．as soon as they saw him
B．as soon as he had finished cleaning himself
C．as soon as he settled down
D．some time after they first saw them
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单项选择题
The particular bird they were watching______.
A．danced with the two hen birds
B．fell off a branch
C．was afraid of the two hen birds
D．cleaned himself in frequency
单项选择题
Which of the following is NOT listed as a light oil
A．Gasoline.
B．Kerosine.
C．Distillate oil.
D．Diesel oil.
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