单项选择题

The professor,（）as a splendid speaker, was warmly received by the students.

A. known
B. knowing
C. to be known
D. having known

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With the introduction of the computer, libraries, today are quite different from they were in the past（）

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

单项选择题

The representative of the company demanded that part of the agreement（）revised.

A. will be
B. is
C. to be
D. be

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