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
What does the woman want to buy（）

A．A hook.
B．Ivory.
C．Sheets.
D．A Ship.
单项选择题
How long has the woman worked（）

A．15.
B．10.
C．5.
D．2.
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