单项选择题

He is used to flying by air and on no occasion （） frightened.

A. he has ever felt
B. be ever feels
C. ever does he feel
D. has he ever felt

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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
单项选择题
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
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