若点的两个投影均在直线的同面投影上,则该点就一定在该直线上。
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We have an exam tomorrow,_______?
A. do we
B. don’t we
C. do they
Sally has a big family, ______?
A. hasn’t she
B. hadn’t she
C. had she
You can’t run very fast, ______?
A. can’t you
B. could you
C. can you
Your house isn’t far from here, ______?
A. Isn’t it
B. aren’t they
C. is it