单项选择题

The ______ of my paper on animal communication includes a book on whale songs.

A. biography
B. preface
C. introduction
D. bibliography
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单项选择题
I should very much like to have gone to the party but I ______.
A. was not invited
B. am not invited
C. was not being invited
D. will not be invited
单项选择题
You can find Dr. Johnson in the operating ______.
A. house
B. space
C. room
D. area
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