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

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单项选择题
Where are the two speakers（）

A. At a restaurant.
B. At a parking lot.
C. At a bank.
D. At a supermarket.
填空题
When did the steamboat New Orleans make its first trip（）
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