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
Eating too much fat can __________ heart disease and cause high blood pressure.
A．attribute to
B．attend to
C．contribute to
D．devote to
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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