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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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
When it was my turn to introduce myself, I was so nervous that my mind went ______.
A．blank
B．faint
C．vain
D．dim'
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