单项选择题

All flights ______ because of the storm, they decided to take the train.

A．having cancelled
B．have been cancelled
C．were cancelled
D．having been cancelled
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单项选择题
This magazine can keep you ______ the latest development in the field of medicine.
A．be informed of
B．to inform of
C．informed of
D．informing of
单项选择题
No bread eaten by man is so sweet as ______ earned by his own labour.
A．one
B．that
C．such
D．what
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