单项选择题

You ought to do（）he tells you.

A. where
B. because
C. as
D. which

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单项选择题

What’s the price of one cup（）

A. $ 35.
B. $ 65.
C. $ 20.

单项选择题

Who was the speaker（）

A. A librarian.
B. A professor.
C. A researcher.

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