[ Grammar ]
I attended a lecture __________________ economics at the university.
A. On
B. About
C. In
D. For
Select your answer:

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Transform the sentence “She has been working here for five years” into a question.
A. Has she been working here for five years?
B. Is she working here for five years?
C. Does she work here for five years?
D. Did she work here for five years?
