单项选择题

The subject of these lectures ______ by the lecture committee.

A. is announces
B. have been announced
C. are announced
D. has been announced
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单项选择题
George is one of the brightest students who ______ from New York University.
A. is graduated
B. have graduated
C. has graduated
D. had graduated
单项选择题
This is the best of the automobiles that ______ in working order.
A. is
B. had
C. are
D. have
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