单项选择题

The story happened ______ the night of Oct. 20,1939.

A． at
B． for
C． on
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You have never been to the USA, ______
A． have you
B． do you
C． haven't you
单项选择题
The book is ______ a great help to English learners.
A． thinking to be
B． thinking
C． thought to be
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