单项选择题

They claimed that they did not arrange the demonstration. It was absolutely _______.

A．spontaneous
B．simultaneous
C．synthetic
D．substantial
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单项选择题
Because of the great speed of light, we see a lamp light up almost at the exact moment______.
A．we turn it on
B．when we turn on it
C．that we turn on it
D．which we turn it on
单项选择题
In the first paragraph, the word yet is used to introduce______.
A．contrast
B．a sequence
C．emphasize
D．an example.
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