单项选择题

You have never been to the USA, ______

A． have you
B． do you
C． haven't you
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单项选择题
The book is ______ a great help to English learners.
A． thinking to be
B． thinking
C． thought to be
单项选择题
He heard someone ______ him, so he stopped to have a look.
A． calls
B． call
C． calling
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