单项选择题

Bread and butter ______ popular with the westerners.

[A] is
[B] are
[C] were
[D] be
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单项选择题
The President was ______ by the directors as she toured the factory.
[A] accompanied
[B] attended
[C] escorted
[D] convoyed
单项选择题
All the investigations ______ before the deadline, the staff decided to have a party as a celebration.
[A] been fulfilled
[B] had been fulfilled
[C] were fulfilled
[D] having been fulfilled
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