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
The defense system will ______ if no proper identifying signal is given.
A．maintain
B．compact
C．condense
D．activate
单项选择题
There is a way ______ he can be saved.
A．whereas
B．whereby
C．while
D．thereafter
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