Twenty-four members took part in the debate, most of them making speeches（）to the chairman.

单项选择题The President of Harvard pioneered the elective system by（）students were able to choose their own courses of study.

A. what
B. whom
C. that
D. which

单项选择题When can you read Jones’ new book in the library（）

A. In May.  
B. In March.   
C. In August.
D. In June.