单项选择题

The president promised to keep all the board members______ of how the negotiations were going on.

A．inform
B．informing
C．be informed
D．informed
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单项选择题
All the tasks ______ ahead of time, they decided to go on holiday for a week.
A．been fulfilled
B．having been fulfilled
C．were fulfilled
D．had been fulfilled
单项选择题
We shall probably never be able to ______ the exact nature of these sub-atomic particles.
A．assert
B．impart
C．ascertain
D．notify
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