单项选择题

Prior to our conference, the executive director had requested that everyone______ well prepared.

A．is
B．be
C．was
D．will be
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单项选择题
The bond of true affection had pulled us six very different men from six very different countries across Antarctica; we proved in the end that we weren't very different______.
A．for all
B．as usual
C．after all
D．in particular
单项选择题
All experts agree that the most important consideration with diet drugs is carefully______ the risks and benefits.
A．weighing
B．valuing
C．evaluating
D．distinguishing
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