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
A Dream of Red Chamber is said ______ into several languages ill the last decade.
A．to translate
B．to be translated
C．to have been translated
D．been translated
单项选择题
This type of apparatus can produce more than 40,000 blood ______ a day.
A．examples
B．models
C．samples
D．specimen
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