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
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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
单项选择题
The magician made us think he cut the girl into pieces but it was merely an______
A．illusion
B．impression
C．image
D．illumination
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