单项选择题

-- Are you a teacher
-- I______, but now I am working in a company.

A. is
B. am
C. was
D. had
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单项选择题
The class ______ in the hall, listening to a lecture.
A. was
B. were
C. been
D. have
单项选择题
I, not you, ______ responsible for all this.
A. am
B. are
C. is
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