单项选择题

He added a ______ to his letter by saying that he would arrive before 8 pm.

A．presidency
B．prestige
C．postscript
D．preliminary
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单项选择题
She made two copies of this poem and posted them ______ to different publishers.
A．sensationally
B．simultaneously
C．strenuously
D．simply
单项选择题
It's amazing that two researchers working independently made the same discovery ______ .
A．spontaneously
B．simultaneously
C．collaboratively
D．conscientiously
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