单项选择题

A．The could agree upon certain signs.
B．They could write them down.
C．They could communicate with each other.
D．They could combine them.
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单项选择题
The suspect______ that he had not been in the neighbourhood at the time of the crime.
A．advocated
B．alleged
C．asserted
D．announced
单项选择题
She sat there brooding______ whether such a life is worth living.
A．for
B．above
C．over
D．under
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