如图，在平面直角坐标系中，直线y=﹣3x+3与x轴、y轴分别交于A、B两点，以AB为边在第一象限作正方形ABCD，点D在双曲线 y=kx （k≠0）上．将正方形沿x轴负方向平移a个单位长度后，点C恰好落在该双曲线上，则a的值是（ ）
阅读短文，判断正误。
Hi, my friend! I'm Mary. I'm from the UK. I'm 9. At school, my father is my English teacher. And I'm his pupil. I like watermelons and strawberries. Look！This is my new schoolbag, I have nine books and a nice pencil box. How many books do you have?
—The plane is leaving right now, but Jim hasn't arrived yet.—Well, he said he _____here on time.
