— Tom, who will give ______ lecture? What is it about?
— Professor Chen, ______ president of Beijing University, about pollution.
A. the, a B. a, the C. the, 不填 D. a, 不填
— Tom, who will give ______ lecture? What is it about?
— Professor Chen, ______ president of Beijing University, about pollution.
A. the, a B. a, the C. the, 不填 D. a, 不填
C