单项选择题

My telephone number is 5436236. Have you ______

A. written them down
B. written down it
C. written it down
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单项选择题
—My brother wants to be a doctor when he grows up. —so ______ I.
A. do
B. am
C. will
单项选择题
The little boy is very young, ______ he can look after himself well.
A. so
B. but
C. if
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