A:to canceling
B:not to canceling
C:not to cancel
D:to not canceling
太阳是____系的一颗____星,地球是____的一颗 ____行星,月球是____的一颗____星。
注意:1). 词数100左右;
2). 信的开头已给出,不计入总词数;
3). 可适当增加内容,以使行文流畅
Dear Rob,
How is it going? Now, it's my turn to tell you about the Chinese school system.
Yours,
Li Kang