单项选择题

The little boy didn't know ______.

A. where will he go
B. what he would do next
C. when could he go
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You haven't changed your mind, ______
A. do you
B. are you
C. have you
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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