单项选择题

You haven't changed your mind, ______

A. do you
B. are you
C. have you
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单项选择题
My telephone number is 5436236. Have you ______
A. written them down
B. written down it
C. written it down
单项选择题
—My brother wants to be a doctor when he grows up. —so ______ I.
A. do
B. am
C. will
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